JP4823292B2 - Toothed belt pulley - Google Patents

Description

  The present invention relates to a pulley for a toothed belt that engages with a toothed belt and transmits a rotational motion.

  Conventionally, there is a toothed belt pulley that releases air before the toothed belt pulley meshes with the toothed belt, reduces the generation of fluid noise and burst noise when compressed air leaks from the gap, and reduces noise. It is known.

As shown in FIGS. 5 to 7, this known toothed belt pulley 500 is formed with a circumferential cut portion 502 in a tooth 501 that meshes with the toothed belt 510, and the toothed belt pulley 500 is connected to the toothed belt pulley 500. By allowing air to escape from the cut portion 502 toward the tooth bottom portion 503 before meshing with the toothed belt 510, the compressed air leaks from the gap between the teeth 501 meshing with the toothed belt 510 to the left and right of the toothed belt pulley 500. The generation of fluid sounds and plosive sounds is reduced, and noise is reduced (see Patent Document 1).
A microfilm (page 3-5, FIGS. 1 to 3) of Japanese Utility Model Application No. 60-178303 (Japanese Utility Model Application Publication No. 62-87251)

  However, since the known toothed belt pulley 500 needs to form the circumferential cut portion 502 in the teeth 501 by cutting or the like, the manufacturing cost increases due to an increase in the manufacturing process, and the manufacturing is increased. There was a problem that the production time was lowered due to longer time.

  In addition, since the depth of the cut portion 502 is limited by the height of the teeth 501, there is a limit to the amount of air that can escape, and fluid noise and burst sound flowing through the cut portion 502 are also generated. There was a problem that the reduction effect was low.

  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 manufacturing cost by simplifying the manufacturing process, shorten the manufacturing time, and improve the production efficiency. It is intended to provide a pulley for a toothed belt that can reduce the occurrence of fluid noise and plosive noise and meshing noise and stably reduce noise.

  The invention according to claim 1 is a pulley for a toothed belt comprising a disc body having an inner periphery fitted to a rotating shaft and having teeth engaged with the toothed belt on the outer periphery, and is divided in the rotating shaft direction. A plurality of disc bodies are fitted with a gap in the direction of the rotation axis, and a gap holding body sandwiched between the plurality of disc bodies with an inner circumference fitted to the rotation shaft and the gap holding The sound absorbing member sandwiched between the plurality of disk bodies with the inner circumference fitted to the body is provided in the gap, thereby solving the above-mentioned problem.

  In addition to the configuration of the toothed belt pulley according to the first aspect, the invention according to the second aspect further solves the problem by forming the outer periphery of the sound absorbing member into a non-circular shape. Is.

  The invention according to claim 1 is a pulley for a toothed belt comprising a disk body having an inner periphery fitted to a rotation shaft and having an outer periphery engaged with a toothed belt. The plurality of disk bodies are fitted with a gap in the direction of the rotation axis, and a sound absorbing member sandwiched between the plurality of disk bodies is provided in the gap. Allows the compressed air when the toothed belt pulley meshes with the toothed belt to escape to the space between multiple disc bodies, reducing the generation of fluid noise and plosive noise, and others In addition to noise, the noise is reduced by the sound-absorbing member, and it is not necessary to apply any processing to multiple disc bodies, simplifying the manufacturing process and reducing manufacturing costs. Is, it is possible to improve the production efficiency is shortened manufacturing time.

  The gap is further provided with a gap holding body sandwiched between a plurality of disk bodies, and the gap holding body is fitted to the rotating shaft on the inner circumference, and the sound absorbing member holds the gap on the inner circumference. By being fitted to the body, the gaps between the plurality of disk bodies can be stably maintained, and the plurality of disk bodies do not compress the sound absorbing member and impair the sound absorption effect. Is reduced.

  The pulley for toothed belt of the invention according to claim 2 has a plurality of sound absorbing members formed in a non-circular shape on the outer periphery in addition to the effect exhibited by the pulley for toothed belt according to claim 1. The radial depth of the space sandwiched between the disk bodies changes in the circumferential direction, ensuring the capacity of the space where the air compressed by the small-diameter portion flows in and maintaining the effect of reducing fluid noise and plosive sound, while absorbing sound The volume of the member can be increased to maintain the sound absorption effect.

  The present invention relates to a pulley for a toothed belt comprising a disk body having an inner periphery fitted to a rotating shaft and having teeth engaged with the toothed belt on the outer periphery. The gap holder is fitted with a gap in the direction of the rotation axis, the inner circumference is fitted to the rotation axis and the gap holder is sandwiched between a plurality of disk bodies, and the inner circumference is fitted to the gap holder. The sound absorbing member sandwiched between the disc bodies is provided in the gap, reducing the manufacturing cost, reducing the manufacturing time, improving the production efficiency, reducing the generation of fluid noise and plosive noise and meshing noise, and noise As long as it provides a pulley for a toothed belt that can be stably reduced, any specific embodiment may be used.

That is, the material of the disk body of the pulley for toothed belt of the present invention may be a metal such as iron or any material such as resin or ceramic.
Further, the number of the disk bodies may be two, or three or more.
The sound absorbing member of the toothed belt pulley of the present invention may be any material as long as it has a sound absorbing effect, such as rubber, foamed rubber, polyethylene, urethane resin, foamed resin, felt, glass wool, and cotton. Also good.
Further, the material of the gap holding member of the pulley for toothed belt of the present invention may be a metal such as iron, or any material as long as it is harder than the sound absorbing member such as resin, ceramic, rubber or the like. good.

Further, the disk body of the toothed belt pulley of the present invention may be fitted to the rotating shaft by an interference fit such as press fit or shrink fit, or may be fixed with a bolt, a nut, etc. It may be fitted with. A keyway or a spline may be used.
Furthermore, the sound absorbing member and the gap holder used in the toothed belt pulley of the present invention may be simply sandwiched and fixed between the disk bodies, and are fitted to the rotating shaft in the same manner as the disk bodies. May be.
Further, the disk body may be rotationally engaged with a pin, unevenness or the like.

Below, the pulley for toothed belts which is an example of the present invention is explained based on a drawing.
FIG. 1 is a perspective view of a usage pattern of a toothed belt pulley of the present invention, and FIG. 2 is a front view and a sectional view of a toothed belt pulley which is a reference example for helping understanding of the present invention. FIG. 3 is a front view and a sectional view of the toothed belt pulley according to the first embodiment of the present invention, and FIG. 4 is a front view of the toothed belt pulley according to the third embodiment of the present invention. It is sectional drawing.

  First, in the toothed belt pulley 100 according to the present invention, as shown in FIG. 1, two disk bodies 105 and 106 are fitted on a rotating shaft 104 with a gap 120 therebetween, and the toothed belt 110 is a disk. Rotating motion is transmitted by engaging with teeth 101 provided on the outer periphery of the bodies 105 and 106.

  Here, a toothed belt pulley 100, which is a reference example for helping understanding of the present invention, will be described. As shown in FIG. 2, two disk bodies 105, 106 sandwich a sound absorbing member 121 between rotating shafts 104. And a gap 120 corresponding to the axial thickness of the rotating shaft 104 of the sound absorbing member 121 is secured.

  The space formed by the gap 120 has a difference depth between the outer diameter of the sound absorbing member 121 and the diameter of the tooth bottom portion 103 of the two disc bodies 105 and 106, and the thickness of the sound absorbing member 121 in the axial direction of the rotating shaft 104. The air compressed when the tooth 101 of the toothed belt pulley 100 meshes with the toothed belt 110 in this space is released while suppressing the increase in pressure and flow velocity. The noise absorbing member 121 absorbs and reduces noise including other meshing noises.

  Therefore, in the toothed belt pulley 100 according to the first embodiment of the present invention, as shown in FIG. 3, the gap holding is performed in which the two disc bodies 105 and 106 are fitted to the rotating shaft 104. The body 130 and the sound absorbing member 122 fitted to the outer periphery of the gap holder 130 are sandwiched and secured, and a gap 120 corresponding to the axial thickness of the rotary shaft 104 of the gap holder 130 is secured.

  In the first embodiment, the gap 120 is secured by the gap holder 130 made of a hard material, so that the gap 120 between the two disk bodies 105 and 106 can be stably maintained. The disk bodies 105 and 106 do not compress the sound absorbing member 122 and impair the sound absorbing effect.

  Further, in the toothed belt pulley 100 according to the second embodiment of the present invention, as shown in FIG. 4, the outer peripheral shape of the sound absorbing member 123 is formed in a square shape, and two disk bodies 105 are provided on the rotating shaft 104. , 106 are fitted on both sides of the gap holder 130 fitted to the rotary shaft 104 and the sound absorbing member 123 fitted to the outer periphery of the gap holder 130.

  In the second embodiment, the sound absorbing member 123 uses a sound absorbing member having a circular outer peripheral shape having the same diameter as the outer diameter of the sound absorbing member 123 having the maximum diameter portion so that the capacity of the space formed by the gap 120 is the same. Since it can be made larger than the above, it is easy to ensure both the capacity of the space formed in the gap 120 and the volume of the sound absorbing member 123 to maintain the sound absorbing effect.

  Further, since the outer peripheral shape of the sound absorbing member 123 is non-circular, the compressed air escapes and flows into the gap 120 when the teeth 101 of the two disc bodies 105 and 106 mesh with the toothed belt 110. Since the shape of the configured space is different for each tooth 101 engaged with each other, even if a fluid sound or a bursting sound is generated slightly, the frequency component can be different for each tooth 101 engaged with each other. Noise can be reduced.

  As described above, according to the present invention, the manufacturing cost is reduced, the manufacturing time is shortened, the production efficiency is improved, the generation of fluid sound and plosive sound and the meshing sound are reduced, and the noise is stabilized. The effect is enormous, such as a reduced pulley for a toothed belt can be provided.

The toothed belt pulley 100 according to the first to second embodiments of the present invention has two disk bodies 105 and 106, but may have three or more disk bodies. .
When the toothed belt pulley 100 of the present invention is composed of three or more disk bodies, the gap between all the disk bodies may have a sound absorbing member and a gap holding body, and a part of the sound absorbing belt pulley may be provided. A member or a gap holder may be provided, and the gaps may be the same or different.

  In addition, the disk bodies 105 and 106 of the toothed belt pulley 100 according to the first to second embodiments of the present invention have a simple disk shape, but are fitted around the outer periphery having the teeth 101 and the rotating shaft 104. Only the vicinity of the inner periphery to be worn may be wide and the radial intermediate part may be thinned, or the radial intermediate part may be provided with an axial thinning part. When the teeth 101 of the disk bodies 105 and 106 are engaged with the toothed belt 110, the space formed in the gap 120 through which the compressed air escapes and flows in is further increased, and the shape of the gap 120 becomes irregular. And the generation of plosives can be prevented, and the effect of reducing noise can be further increased.

The perspective view of the usage form of the pulley for toothed belts of this invention. The front view and sectional drawing of the pulley for toothed belts which are the reference examples of this invention. The front view and sectional drawing of the pulley for toothed belts which is 1st Example of this invention. The front view and sectional drawing of the pulley for toothed belts which are 2nd Example of this invention. The side view of the usage form of the conventional pulley for toothed belts. The front view of the conventional pulley for toothed belts. Sectional drawing of the pulley for conventional toothed belts.

100, 500 ... toothed belt pulleys 101, 501 ... teeth 502 ... notches 103, 503 ... tooth bottom 104 ... rotating shaft 105 ... disk body 106 ... disk body 110, 510 ... toothed belt 120 ... gap 121 ... sound absorbing member 122 ... sound absorbing member 123 ... sound absorbing member 130 ... gap holder

Claims (2)

In a pulley for a toothed belt comprising a disk body having a tooth engaged with a toothed belt and fitted on an inner periphery of a rotating shaft,
A plurality of disc bodies divided in the rotation axis direction are fitted with a gap in the rotation axis direction,
A gap holding body sandwiched between the plurality of disk bodies with an inner circumference fitted to the rotating shaft, and a sound absorbing member fitted between the plurality of disk bodies with an inner circumference fitted to the gap holding body, A pulley for a toothed belt provided in the gap.   The pulley for a toothed belt according to claim 1, wherein an outer periphery of the sound absorbing member is formed in a non-circular shape.

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