JPH10132061A - Toothed pulley and belt transmission using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce sliding noises by forming cut portions on flanges arranged axially both ends of a toothed pulley on which teeth and grooves are alternatively arranged correspondingly to axially both ends of the groove, and thereby reducing a contact area of the flange of the toothed pulley and the side surfaces of the belt teeth. SOLUTION: A toothed pulley 1 has a pulley body 2 provided with teeth 3 and grooves 4 arranged alternatively with equal intervals in a circumferential direction, and a pir of flange mebers 5 arranged on both sides of the body 2 in an axial direction. Flanges 6 arranged axially both ends of the main body 2 has each a tapered surface 6a on an inner side located on the outer peripheral side of tooth end of each tooth 3 for increasing a spacing between the flanges 6 toward an outer side in a diameter direction. Cut portions 7 opened to a groove 4 are formed on portions of the flange 6 correspondingly to axially both ends of the groove 4. A contact area between the side surface of the belt tooth and the flange 6 is reduced by an amount of the cut portion 7, so that sliding noises are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toothed pulley having a flange and a belt transmission using the same, and more particularly to a measure for reducing rubbing noise generated by contact between a flange of a toothed pulley and a toothed belt.

[0002]

2. Description of the Related Art In general, a toothed pulley is provided with teeth a and grooves b alternately arranged at equal intervals in a circumferential direction as shown in FIG. Used. That is, as schematically shown in FIG. 16, the tooth portion a of the toothed pulley A meshes with the belt tooth c of the toothed belt B, and for example, by transmitting the rotational force of the pulley A to the belt B, Traveling the attached belt B to convey articles,
Or transmitting power to other pulleys.

When the toothed belt B starts running while meshing with the pulley A, a thrust force is exerted on the belt B in such a manner as to bias the pulley A in the belt width direction (left-right direction in FIG. 16). Therefore, the belt B deviates from the pulley A as it is, and in order to avoid the deviation, flanges d and d are provided on both outer sides in the axial direction of the pulley A (only the left flange d is shown in the figure). It is common to provide That is,
Since the groove side surfaces e and e of the respective groove portions b are formed by portions of both flanges d and d corresponding to both sides in the belt width direction of the respective groove portions b, each belt tooth c which has entered each of the groove portions b is formed.
Can contact the groove side surface e to regulate the movement of the toothed belt B in the belt width direction, thereby preventing the belt B from deviating. Further, the outer peripheral inner surfaces of the two flanges d, d are axially outwardly (upward in the figure) in the axial direction (the left and right directions in the figure) so that each belt tooth c can smoothly enter the groove b. ) Are provided, and the inclined surfaces f, f having a tapered cross section are provided.

[0004]

However, when the flanges d and d are provided as in the conventional toothed pulley A, the belt teeth c and the tooth portions a start to mesh with each other or mesh with each other. At the end, the side of each belt tooth c is a flange d
Rubbing, and this has the disadvantage of increasing noise. For example, when each belt tooth c enters each groove portion b, the side surface of each belt tooth c enters while rubbing against the inclined surface f of the flange d and the groove side surface e. It happens.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a main object of the present invention is to provide a toothed pulley having a flange and a belt transmission device using the same by devising a flange shape of the toothed pulley. Thus, the contact area between the flange of the toothed pulley and the side surface of each tooth of the toothed belt is reduced, so that the rubbing noise can be reduced.

[0006]

In order to achieve the above object, according to the present invention, by cutting off a flange portion forming a groove side surface of a toothed pulley, each belt tooth side and the groove side surface contact each other. I did not do it. Furthermore, by cutting each belt tooth side of the toothed belt, the contact between each belt tooth side and the groove side surface is made more reliable, and each belt tooth side and the flange inclined surface are mutually separated. Avoided contact.

More specifically, according to the first aspect of the present invention, a pulley body in which teeth and grooves are provided alternately and at equal intervals in a circumferential direction, and a plurality of pulley bodies provided on outer peripheral sides on both axial sides of the pulley body. A toothed pulley with a pair of flanges is assumed.

[0008] A cutout portion opened toward each groove portion is provided in a portion (portion forming a groove side surface) of each of the flanges corresponding to both axial sides of each groove portion.

In the above configuration, in a state where the toothed belt wound around the toothed pulley is running, the respective belt teeth of the toothed belt and the tooth portions of the toothed pulley corresponding to the respective belt teeth are formed. When the meshing starts, each belt tooth enters each groove while rubbing the belt side surface of the toothed belt against the flange of the pulley.

[0010] At this time, since there is a cutout portion opened toward the groove portion on the side surface of the groove portion, the contact area between the side surface of the belt teeth entering the groove portion and the flange is reduced by the cutout portion. . Therefore, the contact between the side surface of each belt tooth and the flange (groove side surface) forming the discontinuous portion of the unevenness when viewed from the side surface of the belt is reduced, and the rubbing noise is reduced accordingly.

With the above, the side surface of the belt body comes into more contact with the flange, but this portion is continuous in the belt circumferential direction, and the wrapped portion is already in contact with the flange. , While rubbing relatively smoothly. Further, the side of the belt body comes into contact with the flange on the tip end surface of the tooth portion by the amount that the side surface of each belt tooth does not contact the groove side surface, so the belt width direction on the pulley of the toothed belt is The positioning is performed by the side surface of the belt body abutting on the flange, unlike the conventional case in which each belt tooth side abuts on the groove side surface.

According to a second aspect of the present invention, in the first aspect of the present invention, each cut portion is formed in a range from a portion (groove side surface) corresponding to both axial sides of each groove portion in both flanges to an outer periphery of the flange. To do.

In the above configuration, when the toothed pulley and the toothed belt start or end meshing, each belt tooth moves in the radial direction of the pulley with respect to the flange. That is,
At the beginning of the meshing, they move radially inward, and at the end of the meshing, they move radially outward. At this time, each cutout is formed so as to extend radially outward from the flange groove side surface to the outer periphery of the flange, so that each belt tooth side surface is formed in the same manner as in the case of the first aspect of the present invention. In addition to reducing the contact area with the groove side surface, the contact area between each belt tooth side surface and the flange outer periphery also decreases. Therefore, the rubbing noise between each belt tooth side surface and the flange is further reduced. Further, since the cut portion is formed so as to extend the flange outward in the radial direction, the formability of the flange portion having the cut portion is improved at the time of manufacturing the toothed pulley.

According to a third aspect of the present invention, in the second aspect of the present invention, each cutout is formed so as to penetrate both flanges in the axial direction. In other words, in a nutshell, all parts other than the outer periphery of the flange corresponding to the tip of each tooth part of the toothed pulley are removed.

[0015] In the above construction, each cut-out portion extends through the flange in the axial direction while being formed from the side face of the flange groove to the outer periphery of the flange. As in the case of the second invention, the rubbing noise is further reduced, and the moldability of the flange portion at the time of manufacturing the toothed pulley is improved.

According to a fourth aspect of the present invention, there is provided a toothed pulley according to any one of the first to third aspects of the present invention, and a toothed pulley wound around the toothed pulley, which is disposed on the inner surface side of the endless belt body in the belt circumferential direction. As a belt transmission device composed of a combination with a toothed belt having a plurality of belt teeth at equal intervals, both sides of the belt including both sides of each of the above-mentioned belt teeth have a belt width direction dimension (tooth width) on the tip side. It is formed in a shape cut so as to be smaller than the belt width direction dimension (belt width) on the back side of the belt.

In the above configuration, when each belt tooth of the toothed belt enters each groove of the toothed pulley, the side surface of the belt is cut so that the tooth width is smaller than the belt width. Therefore, the contact area between the side surface of the belt teeth and the flange is reduced by the above-described cut shape. Thus, the non-contact state between the belt tooth side surface and the flange is further ensured. In addition, the contact area between each belt tooth side and the outer periphery of the flange is reduced according to the cut shape, so that the rubbing noise between each belt tooth side and the flange is further reduced.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIGS. 1 and 2 show a toothed pulley 1 according to Embodiment 1 of the present invention.
As shown by the phantom line in FIG. 1, it is used in combination with a toothed belt 10.

The toothed pulley 1 has a pulley body 2 in which teeth 3 and grooves 4 are provided alternately and at equal intervals in a circumferential direction, and both axial sides of the pulley body 2 (left and right directions in FIG. 1). A pair of flange members 5 and 5 provided integrally with each other for rotation
Each tooth 3 is made to enter the corresponding belt groove of the toothed belt 10, and the corresponding belt tooth 10 b of the toothed belt 10 is made to enter each groove 4 so that the toothed belt 10 The transmission of power is carried out between the two. A pair of flanges 6, 6 are formed on the outer periphery of both sides in the axial direction of the pulley body 2 by the outer peripheral portions of the flange members 5, 5. In addition, the tip 3 of each tooth 3
The inner portions of the flanges 6 and 6 located on the outer peripheral side with respect to a are inclined surfaces 6a having a tapered cross section in which the distance between the flanges 6 and 6 increases radially outward (upward in FIG. 1).
It has been.

In the present embodiment, cutouts 7 opened toward the respective grooves 4 are provided at portions corresponding to both axial sides of the respective grooves 4 in the both flanges 6, 6. . 1 and 2, only one flange 6 and cutouts 7, 7,... Provided on the flange 6 are shown, and the other flange and cutout are not shown.

More specifically, each of the cut portions 7 is cut into a U-shaped cross section extending substantially in the circumferential direction over the entire portion of each of the flanges 6 and 6 forming the groove side surface of each groove portion 4. It is formed in a shape. The groove width (the radial dimension of the pulley 1) of each cutout 7 is set to be substantially the same as the depth of the groove 4. Further, both circumferential wall surfaces of each cutout 7 are provided flush with both circumferential wall surfaces of each groove 4. That is, each cutout portion 7 is provided in all portions except the inclined surface 6 a of the flange 6.

Next, when the toothed belt 10 is wound around the toothed pulley 1 configured as described above and travels, each of the belt teeth 10b enters each of the grooves 4 so that each of the cutouts 7 is removed. The operation will be described. When the toothed belt 10 wound around the toothed pulley 1 is running and each of the belt teeth 10b of the belt 10 and each tooth 3 of the pulley 1 begin to mesh, the side surface of the belt 10 has a flange. The belt teeth 10b enter the respective groove portions 4 while rubbing against the inclined surface 6a of FIG.

At this time, since there is a cutout 7 opened on the side surface of each groove 4 toward the groove 4, the contact area between the side surface of the belt teeth 10b entering the groove 4 and the flange 6 is as described above. The size is reduced by the size of the resection portion 7. Accordingly, there is no contact between the side surface of each belt tooth 10b, which forms a discontinuous portion of the unevenness when viewed from the side surface of the belt, and the groove side surface portion of the flange 6, and the rubbing noise is reduced accordingly.

Since the side surface of each belt tooth 10b does not contact the groove side surface, the side surface of the belt body 10a comes into contact with the flange 6 on the tooth tip 3a of the tooth portion 3 of the pulley 1. Therefore, the positioning of the toothed belt 10 in the belt width direction on the pulley 1 is different from the conventional method in which the side surface of each belt tooth contacts the flange, and the side surface of the belt main body 10a contacts the flange 6. It is done by contact.

Therefore, according to the present embodiment, both sides 1
In the toothed pulley 1 which has a pair of flanges 6 and 6 and is used in combination with the toothed belt 10, a portion corresponding to the groove side surface of each groove 4 in both flanges 6 and 6 faces the groove 4. The flange 6 and the belt teeth 1 are provided only by the cutout 7 because the cutout 7 is opened.
The contact area with the side surface of Ob can be reduced, and the rubbing noise due to such contact can be reduced.

In the first embodiment, each cutout 7 is formed in a U-shaped cross section, but the shape is not particularly limited.

In the first embodiment, each of the cutouts 7
Is formed in a cut shape, but the cut here means that the volume is reduced compared to the conventional flange, and in addition to cutting literally, the cut shape as a result is As long as it is formed, the forming method is not particularly limited.

Further, in the first embodiment, each flange 6 is constituted by the outer peripheral portion of the flange member 5 which is separate from the pulley body 2, but is formed integrally with the pulley body 2. Is also good.

(Embodiment 2) FIGS. 3 to 5 show a toothed pulley 1 according to Embodiment 2 of the present invention. The same parts as those in Embodiment 1 are denoted by the same reference numerals. And its explanation is omitted.

In the present embodiment, each cut portion 7 is formed in a fan shape in a range from the portion corresponding to both axial sides of each groove 4 in both flanges 6, 6 to the inclined surface 6 a of each flange 6. .

More specifically, the cut portion 7 is formed such that only the flange inclined surface 6a located on the outer periphery of the tooth tip 3a of each tooth portion 3 is left in a substantially trapezoidal shape. Further, as shown in FIG. 5, the wall surface of each cutout 7 connected to the bottom surface of each groove 4 is provided flush with the bottom surface. Further, each of the cut portions 7 facing the side surface of the toothed belt 10
Is provided in parallel with the side surface of the belt.

Next, the operation of each cutting section 7 when the toothed belt 10 is wound around the toothed pulley 1 configured as described above and travels will be described. When the belt teeth 10b of the toothed belt 10 enter and exit the respective groove portions 4 of the toothed pulley 1, the respective belt teeth 10b
Moves in the radial direction of the pulley 1 with respect to the flange 6. At this time, since the cutout portion 7 is formed so as to extend radially outward of the flange 6, the area where the side surfaces of the belt teeth 10 b contact the flange 6 at the time of the above-mentioned approach and retreat is small. Become.

Therefore, according to the present embodiment, each cut portion 7 is formed so as to fan out on the inclined surface 6a of the flange 6 as compared with the case of the first embodiment, so that each belt tooth of the toothed belt 10 is formed. The area where the side surface of 10b contacts the flange inclined surface 6a can be reduced, and the rubbing noise can be further reduced. Further, since the cutout 7 is formed so as to extend radially outward of the flange 6, the formability of the flange member 5 having the cutout 7 is improved when the toothed pulley 1 is manufactured. There is also a merit that you can do it.

(Embodiment 3) FIGS. 6 to 8 show a toothed pulley 1 according to Embodiment 3 of the present invention. In this embodiment, the same parts as those in the first and second embodiments are denoted by the same reference numerals, and description thereof will be omitted.

In the present embodiment, each cutout 7 is formed to penetrate each flange 6 in the axial direction.

Specifically, each of the cutouts 7 is provided in a state where the cutout 7 in the second embodiment has the flange 6 penetrated in the axial direction. In other words, only the inclined surface 6a located on the outer peripheral side of the tooth tip 3a of each tooth portion 3 is left, and all other portions are removed.

Therefore, according to the present embodiment, the same effect as that of the second embodiment can be obtained.

(Embodiment 4) FIG. 9 schematically shows a main part of a belt transmission according to Embodiment 4 of the present invention. In this belt transmission, the toothed pulley 1 of the first embodiment is used, and the toothed belt 10 is wrapped around the pulley 1 so as to run. Therefore, regarding the configuration of the toothed pulley 1, the same portions will be denoted by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 10, the toothed belt 10 has a belt body 10a provided in an endless shape, and a belt circumferential direction (the lower surface side in FIG. Are provided at equal intervals in the left-right direction of the drawing).

The belt body 10a has a back rubber layer 11
And a core body 12 buried in a spiral shape extending substantially in the belt circumferential direction on the inner surface side of the back rubber layer 11 and arranged at equal intervals in the belt width direction. On the other hand, each of the belt teeth 10b includes a tooth rubber layer 13 provided integrally with the back rubber layer 11 of the belt body 10a. Further, on the tooth side, a canvas 14 is provided integrally. The material of the back rubber layer 11 and the tooth rubber layer 13 includes CR, hydrogenated NBR, urethane, and the like, but is not particularly limited. Examples of the material of the core body 12 include glass, steel, and aramid, but are not particularly limited. Further, the material of the canvas 13 is not particularly limited, such as nylon and aramid.

In this embodiment, as shown in FIG. 11, both side surfaces of each of the belt teeth 10b have a dimension W ₁ (tooth width) in the belt width direction on the tip side (the lower side in the figure). Is formed to be smaller (W ₁ <W ₀ ) than the dimension W ₀ (belt width) in the belt width direction on the back side of the belt (upper side in the figure). Specifically, each belt tooth 1
The shape of the cut portion on both side surfaces of Ob is tapered in cross section so that the dimension in the belt width direction becomes gradually smaller toward the tooth tip.

More specifically, each of the belt teeth 10b
Are cut at a predetermined inclination angle α from the portion on the inner surface side of the belt of the core body 12 toward the tooth tip. At this time, the inclination angle α (for example, α = 46 °)
Is the inclination angle β of the flange inclined surface 6a of the toothed pulley 1.
(Eg, β = 10 °) (α> β).

In addition, each cut width w (for example, w) on both sides of the tooth tip in the cut portions on both sides of each belt tooth 10b.
= 2.0 mm) is the belt tooth height h (for example, h = 1.
9 mm) within a range of 200% (w ≦ 2.00 × h).

Next, the operation of the belt transmission configured as above at the time of starting engagement will be described. In a state where the toothed belt 10 wound around the toothed pulley 1 is running, meshing between each belt tooth 10b of the belt 10 and each tooth portion 3 of the toothed pulley 1 corresponding to each belt tooth 10b. At the beginning, each belt tooth 10b is advanced into each groove 4 of the toothed pulley 1 while the side surface of the belt 10 is rubbing against the flange inclined surface 6a.

At this time, since both side surfaces of each belt tooth 10b are cut in a tapered shape, and the inclination angle α of the tapered surface is larger than the inclination angle β of the flange inclined surface 6a, each belt tooth 10b is Then, both side surfaces do not contact the inclined surface 6a of the flange 6, and the uncut side surface of the belt main body 10a enters in a state of contact with the flange inclined surface 6a. Therefore, the rubbing noise is further reduced by the absence of contact between the side surfaces of the belt teeth 10b, 10b,..., Which form discontinuous portions of the unevenness as viewed from the side of the belt, and the inclined surface 6a of the flange 6. .

At this time, each cutting width w on the tip side of each of the belt teeth 10b is 200% of the belt tooth height h.
Since the width is set in the following range, the cut width w is 2
If it exceeds 00%, problems such as a reduction in the transmission capacity, tooth skipping, and a shortened service life occur, but such problems do not occur.

[0047] Thus, according to this embodiment, on the effects can be obtained according to the first embodiment, the both side surfaces of each belt tooth 10b of the toothed belt 10, the tooth tip width W ₁ is the belt width W ₀ Cut into a tapered cross section smaller than
The inclination angle α of the tapered surface is set to be larger than the inclination angle β of the flange inclined surface 6a of the toothed pulley 1, so that when each belt tooth 10b enters the groove 4 of the toothed pulley 1, The side surfaces of the belt teeth 10b can be prevented from rubbing against the flange inclined surface 6a, and the noise generated between the toothed belt 10 and the toothed pulley 1 can be further reduced accordingly.

Further, since each cut width w on both sides of the tip of each of the belt teeth 10b is set to be 200% or less of the belt tooth height h, the occurrence of troubles due to the cut can be prevented. can do.

Further, only the both side surfaces of each of the belt teeth 10b among the both side surfaces of the belt are cut, so that the side surface of the belt body 10b is brought into contact with the flange 6 as in the case of the first embodiment. The positioning of the belt 10 in the belt width direction on the toothed pulley 1 can be performed.

In the fourth embodiment, the toothed belt 10
Although only the both side surfaces of each of the belt teeth 10b are cut, the side surfaces of the belt including a part or all of the belt body 10a may be cut.

In the fourth embodiment, the toothed belt 1
Although both side surfaces of each of the 0 belt teeth 10b are cut into a tapered cross section, they may be cut so that the cut cross section becomes polygonal or curved.

Further, in the fourth embodiment, both side surfaces of each of the belt teeth 10b of the toothed belt 10 are cut. In addition to cutting literally, such as cutting with a cutter or grinding with a grinder, it may be formed into a shape that is eventually cut, such as shaping by press baking, etc. The formation method is not particularly limited.

(Fifth Embodiment) FIG. 11 schematically shows a main part of a belt transmission according to a fifth embodiment of the present invention. In this belt transmission, the toothed pulley 1 of the second embodiment is used. The toothed belt 10 according to the fourth embodiment is wound around the pulley 1 so as to be able to run.

Therefore, according to the present embodiment, the same effects as those of the above-described second embodiment can be obtained, and also the same effects as those of the above-described fourth embodiment can be obtained.

(Embodiment 6) FIG. 12 schematically shows a main part of a belt transmission according to Embodiment 6 of the present invention. In this belt transmission, the toothed pulley 1 of Embodiment 3 is used. As in the case of the fifth embodiment, the toothed belt 10 of the fourth embodiment is wound so as to run.

Therefore, according to the present embodiment, in addition to the same effects as in the third embodiment, the same effects as those in the fourth embodiment can be obtained.

-Experimental Example- Here, an experiment was conducted in which the toothed pulley of Embodiment 3 was used as an example of the invention, and a noise was measured when the conventional pulley belt was wound around the pulley and the belt was run. explain. Two toothed pulleys having an L shape defined in JIS B 1856 and having 20 teeth were prepared.

Then, a toothed belt was wound between the two toothed pulleys, one of the toothed pulleys was driven to rotate, and the noise level at a portion where the toothed belt was introduced into the toothed pulley was measured. On the other hand, for comparison, a conventional toothed pulley (FIG. 15)
And FIG. 16) as a comparative example, and the same experiment as in the case of the above invention example was performed. FIG. 1 shows the measurement results of the above invention examples.
3 and FIG. 14 show the measurement results of the comparative example.

First, the experimental results of the comparative example are examined.
In a portion surrounded by a dashed-dotted line in FIG. 4, a large number of waveforms having large vertical fluctuations can be seen in a short time. This part is
This is a rubbing noise generated when the flange of the toothed pulley contacts the side surface of the toothed belt. On the other hand, in the case of the invention example, such a waveform is not seen. From these facts, it can be seen that in the example of the invention, the contact between the flange of the toothed pulley and the side surface of the belt is significantly reduced.

[0060]

As described above, according to the first aspect of the present invention, the pulley main body in which the teeth and the grooves are provided alternately and at equal intervals in the circumferential direction, and the outer peripheral portions on both axial sides of the pulley main body. In the toothed pulley provided with a pair of flanges provided in the above, a cutout portion opened toward each groove portion is provided in a portion corresponding to both axial sides of each groove portion in both flanges. Therefore, the contact area between the side surface of the groove and the side surface of each belt tooth can be reduced by the amount of the cut portion, and the rubbing noise generated by the contact between the flange and the side surface of each belt tooth can be reduced.

According to the second aspect of the present invention, since each of the cut portions is formed in a range from a portion corresponding to both axial sides of each groove in both flanges to an outer periphery thereof, rubbing noise is further reduced. In addition, since the cutout is formed so that the flange extends radially outward, the formability of the flange portion during the production of the toothed pulley can be improved.

According to the third aspect of the present invention, since each of the cutout portions is formed so as to penetrate both flanges in the axial direction, the same effect as that of the second aspect of the invention can be obtained. .

According to the fourth aspect of the present invention, the toothed pulley and a plurality of belt teeth wound around the toothed pulley and provided at an inner surface of the endless belt body at equal intervals in a belt circumferential direction. As a belt transmission device including a combination with a toothed belt, both side surfaces of the belt body including both side surfaces of each of the belt teeth are such that a belt width direction dimension on a tooth tip side is smaller than a belt width direction dimension on a belt rear side. Since it is formed in a cut shape, not only can the contact between the belt tooth side and the flange be made more reliable, but also the belt tooth side and the flange inclined surface according to the cut shape. The contact area between the belt teeth and the flange can be further reduced since the contact area between the belt teeth and the flange can be further reduced.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view taken along line II of FIG.

FIG. 2 is a longitudinal sectional view showing a toothed pulley according to the first embodiment of the present invention.

FIG. 3 is a diagram corresponding to FIG. 2, showing a toothed pulley according to a second embodiment of the present invention.

FIG. 4 is an enlarged perspective view showing a main part of the toothed pulley.

FIG. 5 is an enlarged sectional view taken along line VV of FIG. 3;

FIG. 6 is a view corresponding to FIG. 2, showing a toothed pulley according to Embodiment 3 of the present invention.

FIG. 7 is an enlarged view of a main part of the toothed pulley, corresponding to FIG.

FIG. 8 is an enlarged sectional view taken along line VIII-VIII of FIG. 6;

FIG. 9 is a diagram corresponding to FIG. 1, schematically showing a main part of a belt transmission according to a fourth embodiment of the present invention.

FIG. 10 is a longitudinal sectional side view showing a configuration of a toothed belt.

FIG. 11 is a diagram corresponding to FIG. 1, schematically showing a main part of a belt transmission according to a fifth embodiment of the present invention.

FIG. 12 is a diagram corresponding to FIG. 1, schematically showing a main part of a belt transmission according to a sixth embodiment of the present invention.

FIG. 13 is a waveform chart showing a noise result of the invention example in the experimental example.

FIG. 14 shows noise results of a comparative example in an experimental example.
FIG.

FIG. 15 is a view corresponding to FIG. 2 showing a conventional toothed pulley.

16 is an enlarged sectional view taken along line XVI-XVI of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Toothed pulley 2 Pulley main body 3 Tooth 4 Groove 6 Flange 6a Inclined surface 6 Cutout 10 Toothed belt 10a Belt main body 10b Belt tooth W ₁ Tooth width (dimension in the width direction of the tooth tip side) W ₀ Belt width ( Belt width dimension on the back side of the belt) w Cut width

Claims (4)

[Claims] 1. A toothed pulley comprising: a pulley body in which teeth and grooves are provided alternately and at equal intervals in a circumferential direction; and a pair of flanges provided on outer peripheral sides on both axial sides of the pulley body. 3. The toothed pulley according to claim 1, wherein cutouts open toward the respective grooves are provided in portions of the both flanges corresponding to both axial sides of the respective grooves. 2. The toothed pulley according to claim 1, wherein each cut portion is formed in a range from a portion corresponding to both axial sides of each groove portion in both flanges to an outer periphery of the flange. Toothed pulley. 3. The toothed pulley according to claim 2, wherein each cut portion is formed so as to extend through both flanges in the axial direction. 4. A toothed pulley according to claim 1, 2 or 3, and a plurality of belt teeth wound around the toothed pulley and arranged at equal intervals in a belt circumferential direction on an inner surface side of an endless belt main body. A belt transmission device comprising a combination with a toothed belt having, wherein both side surfaces of the belt including both side surfaces of each of the belt teeth have a belt width direction dimension on a tooth tip side smaller than a belt width direction dimension on a belt rear side. A belt transmission device formed in a shape that is cut as much as possible.