JP2006144957A - Transmission device with chain restraining guide - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmission device with a chain restraining guide capable of realizing low noise by achieving smooth disengagement to suppress a variation in the speed of a transmission chain. <P>SOLUTION: The sprocket teeth 122 of a sprocket 120 comprise tooth faces on the front and rear surface sides in the rotating direction facing each other continuously with the bottom thereof. A distance between a virtual reference line x connecting the rotating center of the sprocket 120 to the center of the sprocket teeth 122 and the tooth faces at least on the front side of the sprocket teeth 122 in the rotating direction is formed equal to or larger than the pitch circle portion of the sprocket at the addendum side portion of the pitch circle thereof. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a transmission device with a chain regulation guide that suppresses vertical movement of a transmission chain that meshes with a sprocket and moves in a polygonal shape.

Conventionally, a chain transmission device 500 as shown in FIG. 11 performs power transmission by winding a transmission chain 510 around a sprocket 520 having a tooth profile defined in ISO 606: 1994 (E). As shown in FIG. 12, the used sprocket 520 causes polygonal movement in the transmission chain 510 because the roller R meshes with the bottom 522 a of the sprocket teeth 522 during power transmission.
Further, there is a problem that the vertical motion generated in the transmission chain 510 due to such polygonal motion induces string vibration in the transmission chain 510 until it engages with the sprocket 520 and generates transmission noise. There has been a problem in that stable power transmission cannot be achieved by generating speed fluctuations in the traveling direction.

Therefore, in order to reduce the vertical movement of the transmission chain due to such a conventional polygonal motion, the applicant of the present invention has a rotational front surface in which a large number of sprocket teeth arranged around the sprocket body face each other in succession. From the virtual reference line connecting the rotation center of the sprocket body and the center of the sprocket teeth to at least the tooth surface on the front side in the rotation direction of the sprocket teeth. Has developed a chain transmission device having a sprocket that is larger than the pitch circle portion in the tooth tip side portion of the pitch circle (see, for example, Patent Document 1).
Japanese Patent Application No. 2003-271106

  However, the chain transmission device of the present applicant disclosed in the specification of Japanese Patent Application No. 2003-271106 is based on the change in chain pitch according to the number of sprocket teeth, the number of rotations, etc., or due to wear of the transmission chain, and the sprocket. Because of the frictional resistance between the chain and the chain, the meshing position and the disengagement position of the transmission chain and sprocket may be slightly displaced, so the suppression of speed fluctuations and the reduction of transmission noise cannot be reliably achieved. There was room for improvement.

  Accordingly, an object of the present invention is to eliminate the problems of the prior art as described above, and to reliably suppress the vertical movement of the transmission chain due to polygonal movement during meshing driving and achieve smooth meshing. Then, it is providing the transmission apparatus with a chain regulation guide which can implement | achieve the low noise which suppressed the speed fluctuation of the transmission chain.

  The invention according to claim 1 is the chain transmission device in which the transmission chain meshes with the sprocket to transmit power, and the sprocket teeth of the sprocket continuously rotate toward the tooth bottom and face the tooth surface on the front side in the rotation direction and the rotation direction. A distance from a virtual reference line connecting the rotation center of the sprocket and the center of the sprocket tooth to at least the tooth surface on the front side in the rotation direction of the sprocket tooth at the tip side portion from the pitch circle. Chain regulation which makes the root circle diameter of the sprocket teeth smaller than the root circle diameter of the ISO tooth profile corresponding to the sprocket teeth, and regulates the chordal action of the transmission chain. The guide is provided at least at one place on the chain orbit It is intended to achieve the above object.

  The invention according to claim 2 further achieves the object by providing the chain regulation guide in the meshing region of the chain orbit in addition to the configuration according to claim 1. .

Further, the invention according to claim 3 provides the above object by providing the chain regulation guide in a disengagement region of the chain orbit in addition to the configuration according to claim 1 or claim 2. More to be achieved.
The “codel action” as used in the present invention refers to the vertical movement of the transmission chain accompanying the regular polygonal movement of the sprocket that occurs when the transmission chain is wound around the sprocket.

  The transmission device with a chain regulation guide according to the present invention comprises a sprocket tooth of a sprocket having a tooth surface on the front side in the rotational direction and a tooth surface on the rear side in the rotational direction, which continuously face each other, and a rotation center of the sprocket. The distance from the virtual reference line connecting the center of the sprocket teeth to the tooth surface at least on the front side in the rotational direction of the sprocket teeth is greater than or equal to the pitch circle portion in the tip side portion from the pitch circle, and the bottom of the sprocket teeth By forming the circular diameter to be smaller than the root diameter of the ISO tooth profile corresponding to the sprocket tooth, the roller or bushing of the transmission chain that precedes the rotation of the sprocket is engaged with the sprocket tooth. From the tooth surface on the front side in the rotational direction while rolling in the tooth gap without directly colliding with the bottom Since it moves to the tooth surface on the back side in the rolling direction, the amount of vertical movement of the transmission chain caused by the polygonal movement during meshing drive can be suppressed, achieving smooth meshing and low noise effect. The effect peculiar to this invention shown is produced.

  That is, in the transmission device with a chain regulation guide according to claim 1, the chain regulation guide for regulating the cordal action of the transmission chain is provided in at least one place of the chain orbit so that the transmission chain can be moved up and down. Since it can be further suppressed, even if the use conditions such as the rotation speed of the sprocket are changed, the speed fluctuation can be suppressed and the transmission noise of the transmission chain can be reduced. Further, it is possible to obtain the effect of suppressing the speed fluctuation and reducing the transmission noise of the transmission chain over a long period of time even with changes with time such as wear of the sprocket and the transmission chain.

  The transmission device with a chain regulation guide according to claim 2 has the transmission chain in addition to the effect produced by the invention of claim 1 by providing the chain regulation guide in the meshing region of the chain orbit. Since the vibration of the transmission chain caused by fluctuations in the position of the sprocket entering the sprocket is regulated, the impact when the transmission chain starts to mesh with the sprocket tooth surface is eliminated, and as a result, the transmission chain caused by this collision Fatigue failure is prevented and the durability of the transmission chain can be improved. In addition, since the energy lost due to the collision when the tooth surface of the sprocket meshes with the transmission chain is reduced, the transmission efficiency can be improved.

  Further, in the transmission device with a chain regulation guide according to the third aspect, in addition to the effect produced by the invention according to the first or second aspect, the chain regulation guide is provided in a disengagement region of the chain orbit. Therefore, the vertical movement of the transmission chain due to fluctuations in the disengagement position, which tends to occur in the disengagement region, is restricted, so the chain loop on the chain return side, usually referred to as the chain slack side, that occurs during high-speed transmission, etc. It is possible to completely avoid the deviation of the orbit, that is, the so-called derailment phenomenon.

  The transmission device with a chain regulation guide according to the present invention comprises a sprocket tooth of a sprocket having a tooth surface on the front side in the rotational direction and a tooth surface on the rear side in the rotational direction, which continuously face each other, and a rotation center of the sprocket. The distance from the virtual reference line connecting the center of the sprocket teeth to the tooth surface at least on the front side in the rotational direction of the sprocket teeth is greater than or equal to the pitch circle portion in the tip side portion from the pitch circle, and the bottom of the sprocket teeth A chain regulation guide for regulating the chordal action of the transmission chain is provided at least at one place on the chain orbital track so that the circle diameter is smaller than the root diameter of the ISO tooth profile corresponding to the sprocket teeth. This ensures that the transmission chain moves up and down due to the polygonal movement during meshing drive. To achieve a smooth disengagement with win, as long as the low noise suppressed speed variation of the transmission chain can be realized, aspects of the specific implementation may any be any one.

  That is, the transmission chain used in the transmission device with a chain regulation guide of the present invention is disclosed by using a roller chain. However, if the transmission chain meshes with the sprocket, other bush chains, offset type Any type of chain such as a chain and a seal chain may be used.

The sprocket used in the transmission device with chain regulation guide according to the present invention comprises a tooth surface on the front side in the rotational direction and a tooth surface on the rear side in the rotational direction, where the sprocket teeth continuously face each other. The distance from the virtual reference line connecting the rotation center and the center of the sprocket tooth to the tooth surface at least on the front side in the rotation direction of the sprocket tooth is made larger than or equal to the pitch circle part in the tip side part from the pitch circle, and the sprocket tooth The diameter of the root circle of the shaft is smaller than the diameter of the root circle of the ISO tooth corresponding to the sprocket teeth, and the roller or bushing of the transmission chain that precedes the rotation of the sprocket engages the sprocket teeth. Rotating from the tooth surface on the front side in the rotational direction while rolling in the tooth gap without directly colliding with the bottom When the subsequent roller or bushing is engaged with the tooth surface on the rear side in the rotational direction, the meshing between the preceding roller or bush and the tooth surface on the rear side in the rotational direction is released. Any transmission chain can be used as long as it can be smoothly disengaged from the sprocket.
Therefore, the specific tooth profile of the sprocket includes a tooth profile in which a curved surface with a substantially concave cross section is formed symmetrically with respect to a virtual reference line connecting the center of the sprocket and the center of the sprocket tooth, and the center of the sprocket and the sprocket tooth. Tooth profile that forms a curved surface with a substantially convex cross section symmetrical to the virtual reference line connecting the center and the virtual reference line connecting the center of the sprocket and the center of the sprocket tooth. A tooth profile that forms a flat surface, is formed asymmetrically with respect to a virtual reference line that connects the center of the sprocket and the center of the sprocket tooth, one tooth surface is formed into a substantially concave curved surface, and the other tooth surface is It is possible to employ a tooth profile formed on a curved surface substantially similar to the tooth surface of the ISO tooth profile corresponding to the sprocket tooth of the above. The diameter of the root circle of the sprocket teeth forming part of the tooth gap is larger than the diameter of the roller or bush of the transmission chain, and the roller or bush of the transmission chain is rotated from the tooth surface on the front side in the rotational direction to the rear side in the rotational direction. The diameter is sufficient to move to the tooth surface.

  The attachment position of the chain regulation guide used in the present invention may be installed in at least one place on the chain inner circumference side or the chain outer circumference side in the meshing area, the meshing off area, and the sprocket area in the chain orbit. When the chain restriction guide is attached to the inner circumference, the chain transmission device itself can be reduced in size, and when the chain restriction guide is attached to both the inner and outer circumferences of the chain, the transmission chain Since the vertical movement can be reliably regulated from the vertical direction, the vertical movement suppressing effect can be remarkably improved.

  Furthermore, the contact part of the transmission chain to be brought into contact with the chain regulation guide used in the present invention may be any of a plate, a roller, a connecting pin, and a side roller constituting the transmission chain. Further, the shape of the chain regulation guide can be changed depending on the part of the transmission chain to be guided, and may be either a plate-shaped guide or a guide roller.

A transmission device with a chain regulation guide according to an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is an overall schematic view of a transmission device with a chain restriction guide according to a first embodiment of the present invention, and FIG. 2 is an explanatory view of a main part of the transmission device with a chain restriction guide according to the first embodiment. 3 is an enlarged view of the sprocket teeth used in this embodiment, FIG. 4 is a view showing a first modification of the sprocket shown in FIG. 3, and FIG. 5 is a view showing the sprocket shown in FIG. FIG. 6 is a diagram showing a third modification of the sprocket shown in FIG. 3, and FIG. 7 is an enlarged view of the meshing area A of FIG. FIG.

A transmission device 100 with a chain regulation guide according to the first embodiment of the present invention shown in FIGS. 1 and 2 includes a transmission chain 110 composed of a roller chain having a large number of Ra, Rb... And the transmission chain 110. A pair of sprockets 120 and 120 to be hung, and a chain regulation guide 130 disposed on the inner side of the chain in the meshing area A of the chain orbit defined by the pair of sprockets 120 and 120 and the transmission chain 110. Yes.
In the present embodiment, the case where a roller chain is used as the transmission chain 110 is disclosed, but if it is a transmission chain that meshes with the sprocket 120, other bush chains, offset type chains, seal chains, etc. Any type of chain can be used.

  Therefore, the sprocket 120 and the chain restriction guide 130, which are the most characteristic features of the transmission device 100 with the chain restriction guide according to the present embodiment, will be described in detail with reference to FIGS.

  First, the sprocket 120 shown in FIG. 3 has a tooth surface 122b on the front side in the rotational direction and a tooth surface 122c on the rear side in the rotational direction in which a large number of sprocket teeth 122 provided around the sprocket body 121 face each other continuously from the tooth bottom 122a. And has.

  That is, the sprocket teeth 122 shown in FIG. 3 have a tooth surface 122b on the front side in the rotation direction of the sprocket teeth 122 and a back surface in the rotation direction with respect to a virtual reference line x connecting the rotation center o of the sprocket body 121 and the center of the sprocket teeth 122. The tooth surface 122c on the side is formed symmetrically, and the tooth surface 122b on the front side in the rotational direction and the tooth surface 122c on the rear side in the rotational direction facing each other are each formed with a curved surface having a substantially concave cross section. The tooth bottom 122a is formed in an arc shape by at least one tooth root arc radius r, and is smoothly continuous with the tooth surface 122b on the front side in the rotational direction and the tooth surface 122c on the rear side in the rotational direction.

  The distance from the virtual reference line x connecting the rotation center o of the sprocket body 121 and the center of the sprocket tooth 122 to the tooth surface 122b on the front side in the rotational direction of the sprocket tooth 122 and the tooth surface 122c on the rear side in the rotational direction is the pitch. The tooth root side diameter is larger than the distance L at the pitch circle portion in the tip side portion from the circle pc, and the root circle diameter df of the present embodiment is an ISO tooth profile tooth corresponding to the sprocket tooth 122 as shown in FIG. It is smaller than the bottom circle diameter Df and has a relationship of df <Df. That is, the root diameter df of the sprocket teeth 122 forming a part of the tooth gap is larger than the diameter of the roller of the transmission chain 110, and the roller of the transmission chain 110 is rotated from the tooth surface 122b on the front side in the rotational direction to the rear surface in the rotational direction. The diameter is sufficient to move to the side tooth surface 122c. 3 indicates the root diameter Df of the ISO tooth profile.

  Note that there are sprockets 220, sprockets 320, and sprockets 420 as disclosed below as modifications of the procket 120 adopted in the transmission device 100 with the chain restriction guide of this embodiment, and any of these is basically employed. The effects are the same and there is no particular difference.

That is, as shown in FIG. 4, the sprocket 220 is similar to the sprocket 120 described above, and a large number of sprocket teeth 222 provided around the sprocket body 221 are arranged on the front side in the rotational direction facing each other in succession to the tooth bottom 222 a. The sprocket tooth 222 includes a tooth surface 222b and a tooth surface 222c on the back side in the rotational direction. The sprocket tooth 222 has a sprocket tooth with respect to a virtual reference line x connecting the rotation center o of the sprocket body 221 and the center of the sprocket tooth 222. The tooth surface 222b on the front side in the rotational direction 222 and the tooth surface 222c on the rear side in the rotational direction are formed symmetrically.
Therefore, in the case of the sprocket 220, the tooth surface 222b on the front side in the rotational direction and the tooth surface 222c on the rear side in the rotational direction facing each other are formed with curved surfaces having a substantially convex cross section, and the tooth bottom 222a is a root arc. It is formed in an arc shape with a radius r.

Further, as shown in FIG. 5, the sprocket 320 is similar to the sprocket 120 described above, and a large number of sprocket teeth 322 provided around the sprocket body 321 continuously face each other on the tooth bottom 322a. The sprocket tooth 320 includes a surface 322b and a tooth surface 322c on the rear side in the rotational direction, and the sprocket tooth 320 includes a sprocket tooth 322 with respect to a virtual reference line x connecting the rotation center o of the sprocket body 321 and the center of the sprocket tooth 322. The tooth surface 322b on the front side in the rotational direction and the tooth surface 322c on the back side in the rotational direction are formed symmetrically.
Accordingly, in the case of the sprocket 320, the tooth surface 322b on the front side in the rotational direction and the tooth surface 322c on the rear side in the rotational direction facing each other are formed in planes substantially parallel to each other, and the tooth bottom 322a is a root arc. It is formed in an arc shape with a radius r.

Furthermore, as shown in FIG. 6, the sprocket 420 is similar to the sprocket 120 described above, and a large number of sprocket teeth 422 provided around the sprocket body 421 continuously face each other in the rotation base 422a. A surface 422b and a tooth surface 422b on the back side in the rotational direction are provided.
Therefore, in the case of the sprocket 420, the sprocket teeth 422 and the tooth surface 422b on the front side in the rotation direction of the sprocket teeth 422 with respect to the virtual reference line x connecting the rotation center o of the sprocket body 421 and the center of the sprocket teeth 422, and the rotation direction. A tooth surface 422c on the back side is formed asymmetrically left and right. The tooth surface 422b and the tooth surface 422c on the rear side in the rotational direction facing each other are formed into a curved surface having a substantially concave cross section, and the tooth surface on the rear side in the rotational direction. 422c is formed with a curved surface substantially similar to the tooth surface of the ISO tooth profile, the tooth bottom 422a is formed in a circular arc shape with a root arc radius r, and the tooth surface on the front side in the rotational direction formed into a curved surface having a substantially concave cross section. The tooth surface 422b and the tooth surface 422c on the back side in the rotational direction formed on a curved surface substantially similar to the tooth surface of the ISO tooth profile are smoothly continuous.

  Next, a chain restriction guide 130 that is the most characteristic of the transmission device 100 with a chain restriction guide according to the present embodiment will be described with reference to FIGS.

  The chain regulation guide 130 usually employs a plate-shaped guide plate used as a fixed guide, and as shown in FIGS. 1 and 2, immediately before the transmission chain 110 is engaged with the constant speed sprocket 120, That is, it is arranged on the inner periphery side of the chain in the meshing area A of the chain orbit.

  Note that the chain regulation guide may be basically installed on any of the meshing area A, the meshing disengagement area B, and the inter-sprocket area C indicated by the dotted line in FIG. However, in the case of the present embodiment, the chain regulation guide 130 is installed on the inner circumference side of the chain in the meshing area A in the chain orbit.

  The operation mode of the transmission device 100 with the chain restriction guide of the first embodiment obtained in this way will be described based on FIG. 2, FIG. 3, and FIG.

  First, as shown in FIGS. 2 to 3, when the sprocket 120 rotates counterclockwise as indicated by an arrow, the roller R of the transmission chain 110 is engaged with the teeth via the chain regulation guide 130 provided in the meshing area A. It moves while meshing into a tooth gap S formed by a tooth surface 122b on the front side in the rotational direction and a tooth surface 122c on the rear side in the rotational direction that face each other continuously from the bottom 122a.

  At this time, as shown in FIG. 7, in the meshing area A between the sprocket 120 and the transmission chain 110, the succeeding roller Rb is already rotated by the sprocket teeth 122 with the preceding roller Ra meshing with the tooth groove S. It meshes with the tooth surface 122b on the front side in the direction. At this time, the center of the preceding roller Ra and the center of the succeeding roller Rb are on the same horizontal line without moving up and down because the roller Rb rolls on the chain regulation guide 130 without contacting the tooth bottom 122a. As the sprocket 120 rotates counterclockwise, each roller R rotates in the tooth gap S or on the chain regulation guide 130 while rotating from the front tooth surface 122b side in the rotational direction. It moves to the tooth surface 122c side on the back side.

In the transmission apparatus 100 with the chain restriction guide of the present embodiment as described above, the vertical movement of the transmission chain 110 can be further suppressed by providing the chain restriction guide 130 in the meshing area A of the chain orbit. Therefore, even if the use conditions such as the rotation speed of the sprocket 120 are changed, the speed fluctuation can be suppressed and the transmission noise of the transmission chain 110 can be reduced. Further, it is possible to obtain the effect of suppressing the speed fluctuation and reducing the transmission noise of the transmission chain 110 over a long period of time with respect to changes with time such as wear of the sprocket 120 and the transmission chain 110.
Since the vibration of the transmission chain 110 caused by the change in the meshing position that tends to occur when the transmission chain 110 enters the sprocket 120 is restricted, the transmission chain 110 starts to mesh with the tooth surface of the sprocket 120. The impact is eliminated, and as a result, the fatigue failure of the transmission chain 110 caused by this collision is prevented, and the durability of the transmission chain 110 can be improved. In addition, since the energy lost due to the collision when the tooth surface of the sprocket 120 and the transmission chain 110 mesh with each other is reduced, the transmission efficiency can be improved, and the effect is enormous.

Next, FIG. 8 thru | or FIG. 10 shows the transmission apparatus 200 with a chain control guide which is 2nd Example of this invention.
FIG. 8 is an overall schematic diagram of a transmission device with a chain restriction guide according to a second embodiment of the present invention, and FIG. 9 is an explanatory view of a main part of the transmission device with a chain restriction guide according to the second embodiment. 10 is an operation diagram in which the meshing region B of FIG. 9 is enlarged.

A transmission device with a chain regulation guide according to an embodiment of the present invention shown in FIG. 8 is similar to the transmission device with a chain regulation guide according to the first embodiment of the present invention described above. And a pair of sprockets 120, 120 around which the transmission chain 110 is hung, and a chain regulation guide 130 disposed on a chain orbit defined by the pair of sprockets 120, 120 and the transmission chain 110. The following description will be made using the same reference numerals as those in the first embodiment.
Therefore, the most characteristic feature of the transmission device 200 with the chain restriction guide of the present embodiment is that the chain restriction guide 130 is installed on the outer periphery side of the chain in the disengagement region B in the chain orbit.

Next, the operation | movement aspect of the transmission apparatus 200 with a chain control guide of the said 2nd Example is demonstrated based on FIG. 9 thru | or FIG.
As shown in FIGS. 9 to 10, when the succeeding roller Rc meshes with the tooth surface 122c on the rear side in the rotational direction in the meshing disengagement region B between the sprocket 120 and the transmission chain 110, the preceding roller Rd It rolls without moving up and down on the guide 130, releases the mesh with the tooth surface 122 c on the back side in the rotational direction, and smoothly engages with the sprocket teeth 122 while being guided by the chain regulation guide 130.

In the transmission apparatus 200 with the chain restriction guide of the present embodiment as described above, the chain restriction guide 130 is provided on the outer peripheral side of the chain in the chain disengagement region B of the chain orbit, thereby further increasing the vertical movement of the transmission chain 110. Therefore, even if the use conditions such as the rotation speed of the sprocket 120 are changed, the speed fluctuation can be suppressed and the transmission noise of the transmission chain 110 can be reduced. Further, it is possible to obtain the effect of suppressing the speed fluctuation and reducing the transmission noise of the transmission chain 110 over a long period of time with respect to changes with time such as wear of the sprocket 120 and the transmission chain 110.
Since the vertical movement of the transmission chain 110 caused by the fluctuation of the disengagement position that tends to occur in the disengagement region B is restricted, the chain loop on the chain return side, which is usually referred to as the chain slack side, that occurs during high-speed transmission, etc. The effect is enormous, such as the possibility of the deviation of the track, the so-called fear of derailment, being completely avoided.

1 is an overall schematic diagram of a transmission device with a chain restriction guide that is a first embodiment of the present invention. FIG. Explanatory drawing of the principal part in the transmission apparatus with a chain control guide of 1st Example. The figure which expanded the tooth | gear of the sprocket used for the present Example. The figure which showed the 1st modification of the sprocket shown in FIG. The figure which showed the 2nd modification of the sprocket shown in FIG. The figure which showed the 3rd modification of the sprocket shown in FIG. The operation | movement figure which expanded and looked at the meshing area | region A of FIG. The whole schematic of the transmission apparatus with a chain control guide which is 2nd Example of this invention. Explanatory drawing of the principal part in the transmission apparatus with a chain control guide of 2nd Example. The operation | movement figure which expanded and looked at the meshing area | region B of FIG. The figure which showed the meshing state in the conventional chain transmission. The figure which expanded and showed the conventional sprocket tooth.

Explanation of symbols

100, 200, 500 ... Transmission device with chain regulation guide 110, 210 ... Transmission chain 120, 220, 320, 420, 520 ... Sprocket 121, 221, 321, 421, 521 ... Sprocket body 122 , 222, 322, 422, 522 ... sprocket teeth 122a, 222a, 322a, 422a, 522a ... tooth bottoms 122b, 222b, 322b, 422b ... tooth surfaces 122c, 222c, 322c on the front side in the rotational direction 422c ・ ・ ・ Tooth surface on the back side in the rotational direction 130 ・ ・ ・ Chain regulation guide A ・ ・ ・ Meshing area B ・ ・ ・ Meshing detachment area C ・ ・ ・ Sprocket area S ・ ・ ・ Tooth groove o ・ ・ ・ Sprocket Center of rotation pc ... Pitch circle Dp ... Pitch circle diameter x ... Center of teeth L · · · distance df · · · root circle diameter Df · · · root circle diameter r · · · tooth bottom arc radius R, Ra, Rb ··· roller

Claims (3)

In the chain transmission device in which the transmission chain meshes with the sprocket and transmits power, the sprocket teeth of the sprocket include a tooth surface on the front side in the rotational direction and a tooth surface on the rear side in the rotational direction that face each other continuously. The distance from the virtual reference line connecting the rotation center of the sprocket and the center of the sprocket tooth to the tooth surface at least on the front side in the rotation direction of the sprocket tooth is made larger than or equal to the pitch circle part in the tip side part from the pitch circle. And the bottom circle diameter of the sprocket tooth is formed to be smaller than the bottom circle diameter of the ISO tooth profile corresponding to the sprocket tooth,
A transmission device with a chain regulation guide, characterized in that a chain regulation guide for regulating the cordal action of the transmission chain is provided in at least one place of the chain orbit.   The transmission device with a chain restriction guide according to claim 1, wherein the chain restriction guide is provided in a meshing region of the chain orbit.   The transmission device with a chain regulation guide according to claim 1 or 2, wherein the chain regulation guide is provided in a disengagement region of the chain orbit.

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