JPS62171544A - Transmission belt - Google Patents

Abstract

PURPOSE:To achieve the effect of noise reduction by arranging a spot coming into contact with the side of the V-shaped pulley groove of a V-block at a position variously separating in a belt running direction per V-block from a central position in the belt running direction of the V-block. CONSTITUTION:Many mutually driven and connected V-blocks 3 engage frictionally with the side 5a of a V-shaped pulley groove separately in order, to make power transmission between a transmission belt and the V-pulley possible as prescribed. The two pulley contacting spots 6 of each of the V-blocks 3 are arranged in the belt running direction of the V-blocks 3, namely on both its sides in right and left directions seeing from the center of the said running direction to make various difference per V-block in a distance measured from the above center to the pulley contacting spot 6 on the pitch line P of the V-block 3 and denoted by (1). The contact pitch of the V-block 3 with the side 5a of the V-shaped pulley groove becomes therefore unequal to disperse noise due to the said contact over a wide frequency range during power transmission, and thereby a noise peak can be removed to achieve the effect of noise reduction as prescribed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to (1) an endless power transmission belt that is used by being passed between grooved pulleys.

(Prior art) This type of power transmission belt is made by connecting a large number of pins adjacent to each other by link blenders to form a link connection body, and drivingly connects to this link connection body and attaching ■-shaped blocks sequentially in the longitudinal direction. It is common to have a similar configuration.

In practical use, a large number of ■-shaped blocks that are drive-connected to each other as described above are wound around the V-groove of the Boo IJ, and
Both sides of the shaped block in the pulley axis direction and the boo IJ
Frictional engagement with the side surface of the V-groove enables power to be transferred between the transmission belt and the groove pulley b.

By the way, such a transmission belt tends to generate noise due to contact between the square block and the side surface of the pulley groove during running. As a countermeasure, it is effective to make the contact pitch between the shaped block and the pulley and groove side unequal so that the noise caused by the contact is not concentrated at a certain frequency but is dispersed over a wide frequency range. It is considered as a thing.

Conventionally, the configuration for this purpose was disclosed in Japanese Unexamined Patent Publication No. 59-22672.
As described in Publication No. 9 (the ■-shaped block is brought into contact with the side surface of the boo IJ V groove at the center in the belt running direction, and the width of the ■-shaped blocks in the pulley axis direction is individually varied to substantially eliminate the above contact pitch). Techniques have been proposed to do this.

(Problems to be Solved by the Invention) However, in this prior art, there is a ■-shaped block that does not come into contact with the side surface of the boo IJ V groove, and the pulley pressing force concentrates on the other ■-shaped blocks, causing damage and abnormalities. In addition, if the pulley (which was in contact with the side surface of the groove) and the shaped block are worn, the pulley (which was not in contact with the groove side surface) and the shaped block (which was not in contact with the groove side) will start to come into contact with each other, causing the noise control effect to be lost. be.

(Means for solving the problem) The present invention does not change the basic dimensions of the ■-shaped block, but moves the portion of the ■-shaped block that contacts the side surface of the pulley V groove in the belt running direction to various positions for each ■-shaped block. By making the contact pitches unequal by making the contact pitches unequal, the noise control effect can be achieved without causing the above-mentioned problems. It is characterized by a configuration in which each ■-shaped block is arranged at various distances away from the center position in the belt running direction in the belt running direction.

(Function) A large number of mutually drive-connected ■-shaped blocks are sequentially and individually frictionally engaged with the groove sides of the pulleys, thereby enabling power transmission between the transmission belt and the ■groove pulley in a predetermined manner.

During this power transmission, the points of the ■-shaped block that contact the side surfaces of the Boo' JV groove are located at various distances from the center of the ■-shaped block in the belt running direction in the belt running direction for each ■-shaped block, resulting in a V-shaped block. Since the contact pitch between the block and the groove boob is unequal, the noise generated due to this contact is not concentrated at a certain frequency but is dispersed over a wide frequency range, eliminating noise peaks and reducing noise. A reduction effect is achieved.

Therefore, the above effects can be achieved without generating ■-shaped blocks that do not contact the side surfaces of the Boo IJ V groove or reducing the number of ■-shaped blocks that contact the side surfaces of the Boo IJ V groove. This prevents the pulley pressing force from concentrating on the shaped block and causing damage or abnormal wear.
Further, even when the ■-shaped block wears out, the contact pitch does not change and the noise suppression effect is not impaired.

Furthermore, since the part of the ■-shaped block that contacts the side surface of the Boo' JV groove is simply shifted in the belt running direction, there is no need to change the basic dimensions of the ■-shaped block. There is no need to prepare one, and there is no cost penalty.

(Example) Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 1 shows an embodiment of the power transmission belt of the present invention, in which reference numeral 1 indicates a large number of pins, and adjacent pins are interconnected by link plates 2 to form an endless chain shape.

Then, a bottle mount ■-shaped block 3 is provided which is rotatably fitted to both ends of each pin 1, and pin l is prevented from being pulled out at both ends of a pin clip 4 that straddles the ■-shaped block.
A large number of ■-shaped blocks 3 are drivingly connected to each other.

In practice, as shown in Figure 1(C), each ■-shaped block 3 is individually wrapped around the boo IJ V groove 5, and the two sides of the ■-shaped block 3 in the direction of the pulley axis are covered with wires as shown in Figure 1(b). ) and the two pulley contact points 6 and the pulley groove side surface 5a.
The frictional engagement between the transmission belt and the groove pulley enables power to be transferred between the transmission belt and the groove pulley.

The two pulley contact points 6 of each ■-shaped block 3 are arranged on both sides of the central position in the left-right direction in the belt running direction of the ■-shaped block (in other words, as shown in FIG. Measurement on P up to pulley contact point 6! The distance indicated by is varied for each ■-shaped block.

In such a configuration, since the distance l varies, the contact pitch between the ■-shaped block 3 and the pulley ■-groove side surface 5a becomes unequal, and the contact pitch between the ■-shaped block 3 and the pulley ■ groove side surface 5a during the above-mentioned power transmission. The noise generated along with this is not concentrated at a certain frequency, but is dispersed over a wide frequency range, so that noise peaks can be eliminated, and a predetermined noise reduction effect can be achieved.

Figure 2 shows the ■-shaped block is a link mount ■-shaped block 7
An example is shown in which the ■-shaped blocks 7 are mounted between adjacent pins 1 to be driven and connected to each other. In this example, as shown in FIG.
Power can be transferred between the transmission belt and the groove pulley by frictional engagement between the two pulley contact points 8 provided on both sides in the axial direction of the pulley (as shown in Figure 2) and the groove side surface 5a of the pulley. do.

In this example as well, the two pulley contact points 8 of each ■-shaped block 7 are placed on both sides of the central position of the ■-shaped block in the belt running direction, and the contact points 8 are placed on both sides of the central position of the ■-shaped block in the belt running direction, and By making the water drop distances variously different for each ■-shaped block at points 1 to 8 where the pulley contacts in the measurement, it is possible to achieve the same noise control effect as in the above-mentioned example.

Although not shown, the bin mount ■-shaped block 3 (
It goes without saying that the above idea of the present invention can be similarly applied to a type of power transmission belt constructed by alternately arranging link mount ■-shaped blocks 7 (see FIG. 1) and link mount ■-shaped blocks 7 (see FIG. 2). .

In addition, in the above example, the transmission belt was described in which two pulley contact points 6 (8) were set for each ■-shaped block 3 (7), but each ■-shaped block or the selected ■-shaped block had one Of course, the above idea of the present invention can also be applied to a case where there are only pulley contact points.

Furthermore, even if the pulley contact points 6 and 8 have deformed shapes as shown in FIG. 3(a), (5), or (C), the pitch line is P
The desired purpose can be achieved by varying the distance indicated by l from the above measurement to the pulley contact point 6 (8) for each ■-shaped block.

By the way, as in the present invention, the pulley contact point 6 (8) is
When shifting the shape block 3 (7) from the center position in the belt running direction in the belt running direction, the amount of shift (the above distance l)
Accordingly, set the pulley contact point 6 (8) higher than the center position of the V-shaped block in the belt running direction (otherwise, the said point will not be able to reliably contact the pulley groove side surface 5a due to the conical shape). .

Here, it is determined how high the pulley contact point 6 (8) needs to be above the center position of the ■-shaped block in the belt running direction.

Figure 4 shows Boo IJ when the running path of the transmission belt with respect to the groove pulley (the center is indicated by 0) is an arc a with radius r.
In the contact situation of the ■-shaped block with the V-groove side surface 5a (conical surface), the ■-shaped block shows only the contact point 6 (8) and the pitch line P with respect to the V-groove side surface 5a. Pulley contact point 6 (8) on pitch line P and boo IJ
Considering the point of contact A' with the V-groove side surface 5a, the apparent increase in the running radius of the power transmission belt Δr with the distance l is expressed as Δr = r − r (1), and this increase According to the amount Δr, point A' is the pulley ■Groove side 5
Amount of height increase Δ of point A' that should be increased in order to make contact with a
A (the amount that should be raised on the other side in the direction perpendicular to the drawing from the point A where the center position N in the belt running direction of the V-shaped block and the two pitch lines intersect) is θ ΔA=2Δr tan − (2) (however, θ is expressed as pulley ■ groove apex angle), and can be found from equations (1) and (2). From this equation (3), the pulley contact point 6 (8) on the pitch line P is at a location proportional to the distance l from the center position (point A) of the ■-shaped block in the belt running direction in order to contact the boo IJ V groove side surface 5a. It is understood that it is necessary to increase the amount by a certain amount, and this predetermined amount is expressed by the above equation (3).

In addition, the pulley contact point 6 located other than on the pitch line P (
The required height increase amount in 8) is obtained by adding and subtracting r in the above formula (3) and a value α corresponding to the amount of deviation from point A'.
It can be found by replacing ±α, but if the pulley contact point 6 (8) contacts the pulley groove side surface 5a near point A' on the pitch line P, power can be transmitted without any problem, so the minimum pitch The pulley contact portion 6 (8) may be formed on the line P so as to satisfy the requirement of the above equation (3).

(Effects of the Invention) Thus, as described above, the power transmission belt of the present invention, in order to make the contact pitch between the Boo IJ V groove side surface 5a and the ■-shaped block 3 (7) unequal for noise countermeasures, the Boo U V groove side surface 5a Since the point 6 (8) of the ■-shaped block that is in contact with the ■-shaped block is placed at various distances (f) away from the center position of the ■-shaped block in the belt running direction in the belt running direction for each ■-shaped block, the pulley contact of the ■-shaped block is Reduce the quantity of parts, or reduce the number of pulleys.
Noise control effects can be achieved without generating ■-shaped blocks that do not come into contact with the groove side surfaces. Therefore, the pressing force of the boob does not concentrate on a specific ■-shaped block and cause its damage or abnormal wear, and when the ■-shaped block wears out, the contact pitch changes and the noise suppression effect is impaired. Nothing like that.

Furthermore, since the part of the ■-shaped block that contacts the pulley ■-groove side surface 5a is simply shifted in the belt running direction, there is no need to change the basic dimensions of the ■-shaped block, and various sizes of ■-shaped blocks are available. Since there is no need to do this, there are no disadvantages in manufacturing or assembly work, and it is advantageous in terms of cost.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the power transmission belt of the present invention; Fig. 1(a) is a plan view thereof, Fig. 1(5) is a side view thereof, Fig. 2(C) is a longitudinal sectional front view thereof, and Fig. 2(a) is a top view thereof. ), (b), and (C) are plan views, side views, and longitudinal sectional front views similar to those of FIGS. 1(a), (b), and (C), respectively showing other examples of the present invention, and FIG. a), (b), and (C) are side views of a ■-shaped block showing still three other examples of the present invention, and FIG. 4 is an explanatory view of the state of contact of the ■-shaped block with the pulley ■ groove side surface. ■...Pin 2...Link play,
3...Bin mount V-shaped block 4...Pin clip 5...Pulley ■Groove 5a.
...Pulley ■Groove side 6...Pulley contact point 7...
・Link mount ■Shaped block end...Pulley contact point Patent applicant Nissan Motor Co., Ltd. Figure 3 (a) (b) (C)

Claims (1)

[Scope of Claims] 1. A power transmission belt including a plurality of V-shaped blocks mutually drive-connected and used by winding these V-shaped blocks around a pulley V-groove, wherein a side surface of the pulley V-groove of the V-shaped block and The contact point is V
A power transmission belt characterized in that each V-shaped block is arranged at various distances away from the center position of the belt in the belt running direction in the belt running direction. 2. The power transmission belt according to claim 1, wherein the location is set a predetermined amount higher than the center position of the V-shaped block in the belt running direction in proportion to the various distances. 3. The predetermined amount is 2(√(r^2+l^2)-r) tanθ/, where r is the running radius of the belt with respect to the pulley V groove, l is the various distances, and θ is the apex angle of the pulley V groove. 2. The power transmission belt according to claim 2, wherein the transmission belt has a value determined by 2.