JP2000074153A - V-ribbed belt and rotation transmitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide V-ribbed belt hardy causing slipping-off or a rib skip generated being influenced by a misalignment of V-ribbed pulley(s) and to provide a rotation transmitting device capable of prolonging the belt lifetime without dropping the transmitting performance substantially, and hardly causing belt slip-off or rib skip generated being influenced by misalignment of the V- ribbed pulley(s). SOLUTION: A rotation transmitting device comprises a pair of V-ribbed pulleys 1a and 1b and a V-ribbed belt 2 stretched over them to make engagement, wherein the groove angle A deg. of the pulleys 1a and 1b is made ranging between 36 deg. and 50 deg., while the rib angle of the belt 2 is made A deg.+(10 deg. ±2.5 deg.), and each rib of the belt 2 is equipped at the forefront face with a projection extensively which can be accommodated without touching the groove-forming walls of the pulleys 1a and 1b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a V-ribbed belt and a rotation transmitting device.

[0002]

2. Description of the Related Art In a motor vehicle, a part of the rotational force of a crankshaft is used as a drive source for an engine accessory. In recent years, this power has been transmitted through a V-ribbed pulley and a V-ribbed belt. .

However, when the V-ribbed pulley is misaligned, there is a problem that the belt is disengaged or a so-called rib jump (a phenomenon of jumping from the groove of the pulley where the rib of the belt is fitted to the adjacent groove) occurs.

[0004] On the other hand, in a motor vehicle, since the rotational fluctuation of the crankshaft is large, a load is applied to the V-ribbed belt itself to cause internal heat generation which shortens the service life. It is used so as to suppress the load from being applied in such a manner that the ribbed belt slips. For example, the material of the surface is devised in order to reduce the friction coefficient of the portion of the V-ribbed belt that comes into contact with the V-ribbed pulley.

[0005] However, in the above method, the friction slip heat generates frictional heat in the V-ribbed belt, so that the life cannot be improved. In addition, the slippage of the V-belt with respect to the V-ribbed pulley deteriorates the power transmission performance. There was a problem that would.

Accordingly, the industry using this type of device is expected to develop a V-ribbed belt which is less likely to be disengaged or so-called rib jump due to the effect of V-ribbed pulley misalignment. The belt life can be improved without substantially lowering the belt length. Further, belt slippage or so-called rib jumping due to the influence of pulley misalignment (jumping from the groove of the pulley where the rib of the belt is fitted to the adjacent groove). phenomenon)
It is hoped that a rotation transmission device that is less likely to cause a problem and a V-ribbed belt used for the rotation transmission device will be developed.

[0007]

Therefore, according to the present invention, it is possible to improve the belt life without substantially lowering the transmission performance, and to further remove the belt due to the effect of misalignment of the V-ribbed pulley and so-called rib jump. Another object of the present invention is to provide a V-ribbed belt that is less likely to cause belt slippage and so-called rib jump due to the influence of V-ribbed pulley misalignment.

[0008]

Means for Solving the Problems (Invention of Claim 1)
The rotation transmission device according to the present invention is a rotation transmission device comprising a pair of V-ribbed pulleys and a V-ribbed belt adapted thereto stretched over the pair of V-ribbed pulleys. ° + (10 ° ± 2.
5 °)], and A ° = 3
The protrusion is set to 6 ° to 50 °, and a protrusion that fits without contacting the groove forming wall of the V-ribbed pulley is extended on the tip end surface of the rib of the V-ribbed belt. According to a second aspect of the present invention, there is provided a rotation transmission device comprising a pair of V-ribbed pulleys and a V-ribbed belt adapted to the V-ribbed pulleys stretched, wherein the V-ribbed pulley has a groove angle of A °. Set the rib angle of the V-ribbed belt to [A ° + (5 ° ± 2.5 °)] or [A ° + (15 ° ±
2.5 °)], and A °
= 36 ° to 45 °, and a protrusion that extends without contacting the groove forming wall of the V-ribbed pulley is provided on the tip end surface of the rib of the V-ribbed belt. (Invention of Claim 3) The V-ribbed belt of the present invention
A V-ribbed belt adapted to this is stretched over a pair of V-ribbed pulleys, and the groove angle of the V-ribbed pulley is set to A °.
Then, the rib angle of the V-ribbed belt is set to [A ° + (10 °
± 2.5 °)] and A
V = 36 ° to 50 °, a V-ribbed belt used for a rotation transmission device, wherein a tip end surface of a rib of the belt has
The protrusion which fits without contacting the groove forming wall of the V-ribbed pulley is extended. (Invention of Claim 4) The V-ribbed belt of the present invention
A V-ribbed belt adapted to this is stretched over a pair of V-ribbed pulleys, and the groove angle of the V-ribbed pulley is set to A °.
Next, the rib angle of the V-ribbed belt is set to [A ° + (5 ° ±
2.5 °)] or [A ° + (15 ° ± 2.5 °)]
A ° = 36 ° to 45 ° with each being set
A V-ribbed belt used in a certain rotation transmission device, wherein a protrusion that fits without contacting a groove-forming wall of a V-ribbed pulley extends on a tip end surface of a rib of the belt. (Invention of Claim 5) The V-ribbed belt of the present invention
A protrusion that extends without contacting the groove-forming wall of the V-ribbed pulley is provided on the end surface of the rib of the belt. (Invention of claim 6) The V-ribbed belt of the invention is:
Regarding the invention according to any one of claims 3 to 5,
The relationship of the height of the rib of the belt: the protrusion = 1.0: 0.3 to 0.8 is established. According to a seventh aspect of the present invention, there is provided a rotation transmission device according to the first or second aspect, wherein the tension applied to the V-ribbed belt can be changed via a tensioned V-ribbed pulley. is there.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings.

The rotation transmitting device according to the first embodiment of the present invention
As shown in FIG. 1, a driving-side V-ribbed pulley 1a, a driven-side V-ribbed pulley 1b attached to a driven shaft,
And a V-ribbed belt 2 stretched between the V-ribbed pulleys 1a and 1b. A groove of the V-ribbed pulleys 1a and 1b is formed on a distal end surface of a rib R of the V-ribbed belt 2 as shown in FIG. A projection T that fits without contacting the component wall is extended. Note that the projection T is made of the same material as the rib R during normal use. Under conditions such as severe heat resistance and bending resistance, the rubber constituting the projection T is more elongated than the rubber constituting the rib R. Use a material that is large and does not cause distortion during forward / reverse bending and compression / tension. The height of the rib R: the height of the projection T = 1.0: 0.
6 (the value is not limited to 0.6 but may be in the range of 0.3 to 0.8).

Each of the components has a diameter of V-ribbed pulleys 1a and 1b: 120 mm The number of grooves of V-ribbed pulleys 1a and 1b: 3 A groove angle of V-ribbed pulleys 1a and 1b: 40 ° A rib angle of V-ribbed belt 2: 50 ° is set.

In the rotation transmitting device according to the second embodiment of the present invention, the groove angle of the V-ribbed pulleys 1a and 1b is 50 °.
The rib angle of the V-ribbed belt 2 is set to 60 °, and the other configuration is the same as that of the first embodiment. [Transmission performance test] Here, V-ribbed pulley 1b
The test was carried out by setting the axial load of the V-ribbed pulley 1a to 2,000 rpm with the axial load of 40 kgf, the slip ratio (%) on the horizontal axis, and the effective tension (kgf) on the vertical axis, and the results of the transmission performance test. (A solid line based on a black square point in FIG. 2 is used for the rotation transmitting device of the first embodiment, and a broken line based on a white square point of FIG. 2 is used for the rotation transmitting device of the second embodiment). Note that effective tension = tension side tension−loose side tension.

Next, a similar test was performed on the following comparative examples 1 and 2 for comparison with the transmission performance of the rotation transmission device of the above embodiment.

"Comparative Example 1"
The configuration is exactly the same as that of the first embodiment of the invention except that the groove angle of the V-ribbed pulleys 1a and 1b is set to 40 ° and the rib angle of the V-ribbed belt is set to 40 °.

A graph of the test results for Comparative Example 1 was like a dash-dot line based on the black dots (see FIG. 2).

[Comparative Example 2] The rotation transmission device of Comparative Example 2 is as follows.
The configuration is exactly the same as that of the first embodiment of the invention except that the groove angle of the V-ribbed pulleys 1a and 1b is set to 40 ° and the rib angle of the V-ribbed belt is set to 36 °.

A graph of the test results for Comparative Example 2 was like a two-dot chain line based on white circles (see FIG. 2).

"What can be determined from the graph of FIG. 2" A. It can be said that the larger the effective tension at which complete slip occurs (the effective tension at the horizontal portion in the graph of FIG. 2), the better the transmission performance. This is because the larger the effective tension is, the larger the dynamic friction coefficient is, and the less likely slip occurs. B. It can be said that the larger the slope of the graph until the complete slip occurs (the inclined portion of the graph in FIG. 2), the better the transmission performance. This is because the greater the slope of the graph, the more difficult it is to slip at the same effective tension.

When examining the graph of FIG. 2 based on the contents of A and B described above, it can be seen that the rotation transmission device of the first embodiment of the present invention has better transmission performance than the rotation transmission devices of Comparative Examples 1 and 2. There was found. Similarly, the rotation transmission device according to the second embodiment of the present invention is different from the rotation transmission devices according to the first and second comparative examples.
It turned out that the transmission performance hardly changed. [Regarding Life Test] Subsequently, as shown in FIG. 3, using a V-ribbed pulley 1c for tension, a rotation transmission device having the same basic configuration as the above-described first and second embodiments and comparative examples 1 and 2 of the present invention. A life test was performed while applying tension to the V-ribbed belt 2. In this rotation transmitting device, the diameter of the V-ribbed pulley 1c: 45 mm The groove angle of the V-ribbed pulley 1c: 40 ° when the belt rib angle is 50 ° 50 ° when the belt rib angle is 60 ° The tension applied to the V-ribbed pulley 1c Force: 85 kgf Load applied to V-ribbed pulley 1b: 1.75 kgm.

Here, the life test of the V-ribbed belt was performed by setting the driving rotation speed of the V-ribbed pulley 1a to 4900 rpm under an atmosphere temperature of 85 ° C. The results are shown in FIG. 4, and it was found from the figure that the belt transmission life of the rotation transmission device of the first embodiment of the present invention was considerably longer than that of the rotation transmission devices of Comparative Examples 1 and 2. In order to find out the cause, for Embodiment 2 and Comparative Example 1, the change in the belt surface temperature of the V-ribbed belt 2 with the running time and the change in the hardness temperature of the rib rubber of the V-ribbed belt 2 with the running time were examined. The graphs (FIGS. 5 and 6) were created for. 5 and 6, the rotation transmitting device of the second embodiment of the present invention has a lower belt surface temperature than the rotation transmitting device of Comparative Example 1 and therefore has a lower curing (deteriorating) speed of the rib rubber of the belt, It is thought that the belt life was extended. It is considered that the same applies to the first embodiment. [Effect test of pulley misalignment] This test was performed under the same conditions using a rotation transmission device having the same configuration as the above life test. The only difference is that, as shown in FIG. 9, the centers of the V-ribbed pulleys 1a and 1b are intentionally shifted (pulley misalignment).

FIG. 10 shows the result of the influence test of the pulley misalignment. The solid line shows the result when the protrusion T is not provided, and the circle shows the result when the protrusion T is provided. From this, it is clear that rib jump is unlikely to occur, and from this result it can be inferred that belt slippage is unlikely to occur. [Effects of the rotation transmitting devices of the first and second embodiments are described.
Te] the transmission performance testing, Figure 2 was created by the impact test life test and the pulley misalignment, 4, 10
Thus, the following is clear. The rotation transmission device according to the first embodiment includes a V-ribbed pulley having a groove angle of 40 ° and a V-shaped pulley having a groove angle of 40 ° specified in the JASO standard.
As compared with a rotation transmission device using a ribbed belt, the transmission performance is excellent and the belt life is improved. The rotation transmitting device according to the second embodiment includes a V-ribbed pulley having a groove angle of 40 ° and a V-shaped pulley having a groove angle of 40 ° specified by the JASO standard.
Compared with a rotation transmission device using a ribbed belt, the power transmission performance hardly changes and the belt life is greatly improved. Even if pulley misalignment occurs, the presence of the protrusion T extending from the tip end surface of the rib R of the V-ribbed belt makes it difficult for the belt to come off from the V-ribbed pulley or for the rib to fly. [Other Embodiments of the Invention] FIG. 7 shows that the groove angles of the V-ribbed pulleys 1a, 1b are 36 °, 40 °, 45 °.
°, 50 °, 55 °, 60 ° and the angle of the V-ribbed belt 2 were 36 °, 40 °, 45 °, 50 °, 55 °.
The test results of the transmission performance (dynamic friction coefficient) and the life of the belt are shown for all combinations of angles of 60 ° and 60 °.

From the data in this table, the groove angle of the V-ribbed pulley is set to A ° and the rib angle of the V-ribbed belt is set to [A °.
+ (10 ° ± 2.5 °)], respectively.
It is apparent that the same effect as in the case of the first and second embodiments can also be obtained for the rotation transmitting device in which A ° = 36 ° to 50 °.

Similarly, from the data in this table, the groove angle of the V-ribbed pulley is set to A °, and the rib angle of the V-ribbed belt is set to [A ° + (5 ° ± 2.5 °)] or [A ° + (15 °). °
± 2.5 °)], and the above A ° =
It is apparent that the same effects as those of the first and second embodiments can be obtained also with the rotation transmitting device having the angle of 36 ° to 45 °.

On the other hand, it has been experimentally confirmed that the same effects as those of the first and second embodiments can be obtained even if the number of grooves or the diameter of the V-ribbed pulley changes.

Further, when a V-ribbed belt 2 having projections T extended is used, the above-described rib jump or belt detachment occurs regardless of the groove angle of the V-ribbed pulleys 1a and 1b and the rib angle of the V-ribbed belt 2. It is clear that it is difficult to do. [The V-ribbed belt and the rotation transmission device of the present invention are used.
Of course, it can be used even when there is almost no rotation fluctuation like an electric motor or a gasoline engine car other than a direct injection type, but it can be used like a diesel engine car or a recent direct injection gasoline engine car. The effect is particularly remarkable in a place where is relatively large.

[0026]

Since the configuration of the present invention is as described above, the following effects can be obtained.

From the contents described in the embodiment of the invention, the life of the belt can be improved without substantially lowering the transmission performance. Further, the belt may be disengaged due to the influence of misalignment of the V-ribbed pulley. A rotation transmitting device that does not easily cause so-called rib jumping can be provided.

From the contents described in the section of the embodiment of the present invention, it was possible to provide a V-ribbed belt which is less likely to be detached from the belt or so-called rib jump due to the influence of misalignment of the V-ribbed pulley.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a rotation transmission device used for a transmission performance test.

FIG. 2 is a graph showing a slip ratio-effective tension showing a result of a transmission performance test.

FIG. 3 is a conceptual diagram of a rotation transmission device used for a belt life test.

FIG. 4 is a graph comparing belt life.

FIG. 5 is a graph of a change in surface temperature of a belt.

FIG. 6 is a graph showing a change in hardness of a rib rubber of a belt.

FIG. 7 is a list showing transmission performance and belt life.

FIG. 8 is a sectional view showing a state in which the V-ribbed belt of the embodiment of the present invention is engaged with the V-ribbed pulley.

FIG. 9 is a conceptual diagram showing a state in which pulley misalignment has occurred in the rotation transmitting device.

FIG. 10 is a graph showing a result of an influence test of a pulley misalignment.

[Explanation of symbols]

 1a V-ribbed pulley 1b V-ribbed pulley 1c V-ribbed pulley 2 V-ribbed belt R rib T Projection

Claims (7)

[Claims] 1. A rotation transmission device comprising a pair of V-ribbed pulleys and a corresponding V-ribbed belt stretched over the pair of V-ribbed pulleys.
The groove angle of the V-ribbed pulley is set to A °, and the rib angle of the V-ribbed belt is set to [A ° + (10 ° ± 2.5 °)].
A ° = 36 ° -50 ° with each being set
A rotation transmitting device further comprising a protrusion that fits without contacting the groove forming wall of the V-ribbed pulley is provided on the tip end surface of the rib of the V-ribbed belt. 2. A rotation transmission device comprising a pair of V-ribbed pulleys and a V-ribbed belt adapted to the pair of V-ribbed pulleys stretched.
The groove angle of the V-ribbed pulley is set to A °, and the rib angle of the V-ribbed belt is set to [A ° + (5 ° ± 2.5 °)] or [A ° + (15 ° ± 2.5 °)], respectively. The angle A is set to 36 ° to 45 °, and a protrusion that fits without contacting the groove forming wall of the V-ribbed pulley is extended on the tip end surface of the rib of the V-ribbed belt. And a rotation transmitting device. 3. A pair of V-ribbed pulleys, each of which is provided with a V-ribbed belt which is adapted to the V-ribbed pulleys. The groove angle of the V-ribbed pulley is A °, and the rib angle of the V-ribbed belt is [A
° + (10 ° ± 2.5 °)], and a V-ribbed belt used for a rotation transmission device wherein A ° = 36 ° to 50 °, wherein a front end surface of a belt rib is provided. A V-ribbed belt, characterized in that a projection that fits without contacting the groove-forming wall of the V-ribbed pulley is extended. 4. A pair of V-ribbed pulleys is provided with a V-ribbed belt which is fitted to the pair of V-ribbed belts, and the V-ribbed pulley has a groove angle of A ° and the V-ribbed belt has a rib angle of [A
° + (5 ° ± 2.5 °)] or [A ° + (15 ° ± 2.
5 °)], and A ° = 3
A V-ribbed belt for use in a rotation transmission device having an angle of 6 ° to 45 °, wherein a protrusion that fits without contacting a groove forming wall of a V-ribbed pulley is extended on a tip end surface of a rib of the belt. V-ribbed belt. 5. A V-ribbed belt, characterized in that a protrusion that fits without contacting a groove-forming wall of a V-ribbed pulley is extended on a tip end surface of a rib of the belt. 6. A height of a rib of a belt: a protrusion = 1.0:
The V-ribbed belt according to any one of claims 3 to 5, wherein a relationship of 0.3 to 0.8 is satisfied. 7. The rotation transmitting device according to claim 1, wherein a tension applied to the V-ribbed belt can be changed via a V-ribbed pulley for tension.