JP4942721B2 - 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. 6 to 8, 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 notch 502 toward the tooth bottom 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, in the known toothed belt pulley 500 as described above, since it is necessary to form the circumferential cut portion 502 in the teeth 501 by cutting or the like, the manufacturing process increases and the manufacturing cost increases, There was a problem that the manufacturing time was prolonged and the production efficiency was lowered.

  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 that flows through the cut portion 502 are also generated. There has been a problem that the effect of reducing is 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 an object of the present invention to provide a pulley for a toothed belt that can reduce noise by preventing generation of fluid sound and burst sound due to compressed air when meshing with a toothed belt.

  The invention according to claim 1 is a pulley for a toothed belt comprising a disk body having an inner periphery fitted to a rotating shaft and engaging teethed belt on the outer periphery, and is divided in the axial direction of the rotating shaft. The plurality of disc bodies are fitted to the rotary shaft with a gap holding body defining a gap in the axial direction of the rotary shaft, and the gap is formed between the outer peripheral diameter of the gap holding body and the disc body. And the inner circumference of the gap holder is fitted to the rotating shaft, and the outer circumference of the gap holder is formed in a non-circular shape. Therefore, the above-described problems are solved.

  According to the first aspect of the present invention, in a pulley for a toothed belt having a disk body having an inner periphery fitted to a rotating shaft and having teeth engaged with a toothed belt on the outer periphery, the disk body includes a plurality of disk bodies in the direction of the rotating shaft. A plurality of disc bodies are fitted with a gap in the axial direction of the rotating shaft, and the compressed air is compressed when the toothed belt pulley meshes with the toothed belt. Since it is possible to escape into the space between the disc bodies, the production of fluid sounds and plosives is prevented, noise is reduced, and it is not necessary to perform any processing on multiple disc bodies. The process can be simplified to reduce the manufacturing cost, the manufacturing time can be shortened, and the production efficiency can be improved.

Since the plurality of disk bodies are fitted to the rotating shaft with the gap holding body defining the gap therebetween, the assembly process for fitting the plurality of disk bodies with a gap in the axial direction of the rotating shaft is simplified. Therefore, the manufacturing cost can be further reduced, the manufacturing time can be shortened and the production efficiency can be improved, and the plurality of disk bodies do not move and the gap is not narrowed. Generation of sound and plosives can be prevented and noise can be reduced.
Further, since the gap described above has a depth of a difference between the outer peripheral diameter of the gap holder and the root diameter of the bottom of the disk body, the toothed belt pulley is inserted into the space formed by the gap. When the teeth mesh with the toothed belt, the compressed air is released while suppressing the increase in pressure and flow velocity. Therefore, it is possible to reduce the noise by preventing the generation of fluid sounds and burst sounds.

In addition, the inner periphery of the gap holder is fitted to the rotating shaft, and the outer circumference of the gap holder is formed in a non-circular shape, so that the radial direction of the space sandwiched between the plurality of disc bodies is increased. Since the depth changes in the circumferential direction, a plurality of disc bodies can be stably maintained in parallel at the large diameter portion, and the volume of the space sandwiched between the plurality of disc bodies at the small diameter portion can be secured to achieve fluid sound. And plosive noise can be prevented and noise can be reduced.
Further, since the outer peripheral shape of the gap holder is non-circular, the space formed by the gap into which the compressed air escapes and flows in when the teeth of the adjacent disk bodies in the axial direction mesh with the toothed belt. Since the shape of the tooth is different for each meshing tooth, even if a slight fluid sound or a popping sound is generated, the frequency component can be made different for each meshing tooth, thereby reducing the overall noise. it can.

  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 engaging teethed belts on the outer periphery, and a plurality of disk bodies divided in the axial direction of the rotating shaft. Is fitted on the rotary shaft with a gap holding member defining a gap in the axial direction of the rotary shaft, and the gap is a difference between the outer diameter of the gap holding member and the root diameter of the tooth bottom portion of the disc body. Having a depth, the inner periphery of the gap holder is fitted to the rotating shaft, and the outer circumference of the gap holder is formed in a non-circular shape, thereby reducing manufacturing costs, If the manufacturing time is shortened and the production efficiency is improved, the fluid noise and the burst sound caused by the compressed air when meshing with the toothed belt are prevented, and the noise is reduced. Whatever the embodiment, It does not matter.

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.
Furthermore, the material of the gap holder of the pulley for toothed belt of the present invention may be a metal such as iron, or any material such as resin, ceramic, rubber.

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 gap holding body of the pulley for toothed belt of the present invention may be simply sandwiched and fixed between the disk bodies, and may be fitted to the rotating shaft in the same manner as the disk body. 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 according to an embodiment of the present invention, and FIG. 2 is a front view and a sectional view of a toothed belt pulley according to a first reference example of the present invention. 3 is a front view and a sectional view of a toothed belt pulley according to a second reference example of the present invention, and FIG. 4 is a front view of a toothed belt pulley according to the first embodiment of the present invention. FIG. 5 is a front view and a sectional view of a toothed belt pulley according to a second embodiment of the present invention.

  As shown in FIG. 1, a pulley 100 for a toothed belt according to an embodiment of the present invention has two disk bodies 105 and 106 fitted on a rotating shaft 104 with a gap 120 therebetween. Is engaged with the teeth 101 provided on the outer circumferences of the disk bodies 105 and 106, so that the rotational motion is transmitted.

  As shown in FIG. 2, a pulley 100 for a toothed belt, which is a first reference example having a structure partially in common with the embodiment of the present invention, has two disk bodies on a rotating shaft 104. 105 and 106 are fitted on both sides of the gap holder 121, and a gap 120 corresponding to the axial thickness of the rotary shaft 104 of the gap holder 121 is secured.

  The space constituted by the gap 120 includes a difference depth between the outer peripheral diameter of the gap holder 121 and the root diameter of the root portion 103 of the two disc bodies 105 and 106, and the rotational shaft 104 of the gap holder 121. It has a width defined by the axial thickness, and 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 increases in pressure and flow velocity. Therefore, generation of fluid sound and plosive sound is prevented, and noise is reduced.

  Further, as shown in FIG. 3, the toothed belt pulley 100 according to the second reference example of the present invention has an outer peripheral diameter of the gap holder 122 larger than that of the gap holder 121 of the first reference example described above. Two disk bodies 105 and 106 are fitted to the rotating shaft 104 with the gap holding body 122 interposed therebetween.

  In the second reference example, the capacity of the space formed in the gap 120 is increased so that the air compressed when the teeth 101 of the two disk bodies 105 and 106 mesh with the toothed belt 110 increases the pressure and flow velocity. By increasing the outer diameter of the gap holding body 122 within a range in which the capacity of the space constituted by the gap 120 can be secured so as to be released while being suppressed, the contact area between the two disk bodies 105 and 106 and the gap holding body 122 is reduced. As a result, the two disk bodies 105 and 106 can be stably kept parallel.

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

  In the first embodiment, since the apex of the outer peripheral shape of the gap holder 123 becomes the maximum diameter portion, the two disk bodies 105 and 106 are stably kept parallel and the capacity of the space formed by the gap 120 is increased. Since the outer peripheral shape having the same diameter is larger than that using a circular gap holder, the capacity of the space formed in the gap 120 is secured and the two disk bodies 105 and 106 are stabilized. Therefore, it is easy to keep both in parallel.

  Further, since the outer peripheral shape of the gap holder 123 is non-circular, the compressed air escapes and flows in when the teeth 101 of the two disc bodies 105 and 106 adjacent in the axial direction engage with the toothed belt 110. Since the shape of the space formed in the gap 120 is different for each tooth 101 engaged with each other, even if a slight fluid sound or a popping sound is generated, the frequency component should be different for each tooth 101 engaged. And noise as a whole can be reduced.

  Further, in the toothed belt pulley 100 according to the second embodiment of the present invention, as shown in FIG. 5, the outer peripheral shape of the gap holder 124 is formed in a shape in which each side of a square is curved in a concave shape in the radial direction. The two disc bodies 105 and 106 are fitted on the rotating shaft 104 with the gap holder 124 interposed therebetween.

  In the second embodiment, each of the vertices of the outer peripheral shape of the gap holder 124 becomes the maximum diameter portion, so that the two disk bodies 105 and 106 can be stably maintained in parallel and are configured by the gap 120. Since the capacity of the space to be formed is made larger than that using the gap holder 123 of the first embodiment, the capacity of the space constituted by the gap 120 is secured and the two disk bodies 105 and 106 are secured. It is even easier to maintain a stable and parallel state.

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

The first and second reference examples and the first and second embodiments of the pulley 100 for toothed belt of the present invention have two disk bodies 105 and 106, but three or more disk bodies are used. You may have.
And when the pulley 100 for toothed belts of this invention is comprised with three or more disk bodies, you may have a gap holding body in the gap | interval pinched | interposed into all the disk bodies, and a gap holding body is partly provided. If there are two or more gap holders, the gap holders may have the same shape or different shapes.

  Further, the disk bodies 105 and 106 of the pulley 100 for the toothed belt according to the first and second reference examples and the first and second embodiments of the present invention are simple disc-shaped, but near the outer periphery having the teeth 101. Further, only the vicinity of the inner periphery fitted to the rotating shaft 104 may be widened and the radial intermediate part may be thinned, or the axially hollowed part may be provided in the radial intermediate part. In this case, when the teeth 101 of the two 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. Therefore, it is possible to further increase the effect of preventing the generation of fluid sound and plosive sound and reducing noise.

The perspective view of the usage form of the pulley for toothed belts which is an Example of this invention. The front view and sectional drawing of the pulley for toothed belts which are the 1st reference examples of this invention. The front view and sectional drawing of the pulley for toothed belts which are the 2nd 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 ... gap holder 122 ... gap holder 123 ... gap holder 124 ... gap holder

Claims (1)

In a pulley for a toothed belt comprising a disk body having an outer periphery with teeth engaged with the inner periphery of the rotating shaft and engaged with the toothed belt,
A plurality of disk bodies divided in the axial direction of the rotary shaft are fitted to the rotary shaft with a gap holding body defining a gap in the axial direction of the rotary shaft,
The gap has a difference depth between the outer peripheral diameter of the gap holder and the root diameter of the bottom of the disk body;
A pulley for a toothed belt, wherein an inner periphery of the gap holder is fitted to the rotation shaft, and an outer circumference of the gap holder is formed in a non-circular shape.

Images