JPS639751A - Transmission belt - Google Patents

Abstract

PURPOSE:To enable reduction of the generation of noise by reducing production of chord vibration, by a method wherein plural endless link coupling bodies are positioned in juxtaposition in a manner to be displaced in the position of a pin. CONSTITUTION:When a transmission belt is stretched around V-groove pulleys by engaging a V-block 6 around a pulley V-groove 7, a power is transmitted from a block 6, engaged with the V-groove, to link coupling bodies 3 and 4, and is further transmitted through the block 6 engaged with the V-groove of a pulley on the driven side, and a power is delivered between the tow pulleys. The link coupling bodies 3 and 4 make a 2-piece set, and by arranged the link coupling bodies in juxtaposition in a manner to be displaced in the position of a pin 1, the alignment pitch of the pin 1 is reduced to half from L to L/2, and the bending pitch of the transmission belt wound around the pully V-groove 7 can be reduced to half. The polygonal winding shape of the belt around the pulley is formed further in a similar shape to that of a circle, and when the block 6 is engaged around the pulley V-groove 7 and during delivery, a position contact with the V-groover is slightly displaced axially of the pulley, and production of chord vibration and the generation of noise can be prevented.

Description

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

(Prior Art) Various types of power transmission belts of this type have been known in the past, such as those shown in Japanese Patent Laid-Open No. 59-144843 and Japanese Patent Laid-Open No. 59-42345.

This power transmission belt includes a link assembly formed by connecting a number of adjacent pins to each other by link plates, and a series of V-shaped blocks are provided on the link assembly so as to be slidable in the longitudinal direction. In practical use, the ■-shaped block is
Wrap it around the JV groove and enable power to be transferred between the two groove pulleys.

(Problem to be solved by the invention) However, in the lever type transmission belt, the ■ shaped block is the pulley.
Polygonal winding caused by the presence of link plates when caught in a groove or unwound may occur due to the shape of the pulley.
Since the contact position with the groove is changed in the radial direction of the pulley, string vibrations occur in the linear portion of the transmission belt between the V-groove pulleys, which repeatedly move toward and away from each other. This string vibration not only causes the V-shaped block to collide with the pulley and generates abnormal noise, but also causes vibrations due to fluctuations in the tension of the transmission belt to increase noise.

Also, in the part of the transmission belt that wraps around the pulley groove,
Since the center of the link plate is closer to the pulley rotation center than both ends, the V-shaped block at the center of the link pulley frictionally engages with the pulley groove, but the ■-shaped blocks at both ends of the link plate float within the pulley groove. , the load is concentrated on the ■-shaped block in the center of the link plate, resulting in a decrease in durability.

In order to solve this problem, it is possible to reduce the arrangement pitch of the pins, but in the conventional power transmission belt, the length of the link plate, which is determined by the pin diameter and its relationship, can only be reduced to the extent that the strength is important. However, there is a limit to reducing the pin arrangement pitch (approximately 811), and the above-mentioned problem cannot be solved with such an arrangement pitch.

(Means for Solving the Problems) The present invention is designed to reduce the arrangement pitch of pins by using multiple rows of link connecting bodies, and connects a large number of adjacent pins with link plates. A plurality of endless link connecting bodies made of It is characterized by a configuration in which the endless link connecting bodies arranged side by side are sequentially slidable in the longitudinal direction.

(Function) During practical use of a power transmission belt that is passed between grooved pulleys, the power from the driving pulley is transferred from the ■-shaped block that is frictionally engaged with the V-groove to the multiple link connections, and then to the driven side. It reaches the pulley through a ■-shaped block that is frictionally engaged with the ■ groove of the pulley, allowing power to be transferred between both pulleys.

By the way, by arranging a plurality of link connectors side by side so that the pin positions are shifted, the arrangement pitch of the pins becomes smaller as the distance between the pins of the link connectors, and the bending pitch of the power transmission belt can be reduced. As a result, the shape of the polygonal winding of the transmission belt around the pulley becomes close to a circle, and when the ■-shaped block is wound into the V-groove of the pulley or when it is unwound, the contact position with the groove of the pulley is slightly reduced in the pulley radial direction. It is not displaced and can reduce string vibration. Therefore, the ■-shaped block hardly collides with the pulley due to string vibration and generates abnormal noise, and the tension fluctuation of the transmission belt due to string vibration is also slight, and the noise caused by this can be almost eliminated.

Furthermore, the following effects can also be obtained by arranging a plurality of link connectors in parallel so that the pin positions are shifted.

In other words, in the transmission heald portion wrapped around the pulley groove, even if each ■-shaped block is located at both ends of the link plate of the link connection body, it is located in the center of the link plate of the other link connection body, so the latter The link plate ensures frictional engagement with the pulley groove, eliminating the ■-shaped block floating in the pulley groove. Therefore, the load can be distributed to all the V-shaped blocks in the pulley groove,
It is possible to eliminate the problem of load concentration on a specific ■-shaped block.

(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 (a) is a cutaway plan view of the main part, (b) is a longitudinal sectional front view, and (C) is a longitudinal sectional side view of the main part.

Reference numeral 1 in these figures indicates a large number of pins, and adjacent pins are interconnected by link plates 2 to form an endless link connection body 3.4. Each pin 1 is a well-known silent pin consisting of two parts 1a and 1b divided in the radial direction, and by making the dividing surfaces mutually inverted cylindrical surfaces, the link plate 2 is formed as shown in Fig. 1(C). Rotation is possible by rolling contact of the inverted circular divided surfaces with each other.

In this example, two endless link connectors 3 and 4 are arranged side by side so that the pins 1 are shifted in position, and the pin 1 of each link connector is inserted between the pins 1 of the other link connector. At this time, if there is a gap between the ends of the pins 1 that have entered each other, this gap is filled with the bush 5 (only one is shown for convenience in the drawing), so that the relative position in the longitudinal direction of the link connecting body 3.4 remains unchanged. so that it is maintained.

A square block 6 which laterally surrounds the link bodies 3 and 4 is provided so as to be slidable in the longitudinal direction of the link bodies 3 and 4. Therefore, a protrusion 6b is provided between the windows 6d formed in each ■-shaped block 6, thereby keeping the relative position of the link connectors 3, 4 in the pin +11 axial direction unchanged.

In assembling the above-mentioned power transmission belt, the link connecting bodies 3.4 are assembled immediately before they are made into an endless state, and these link connecting bodies 3.4 are arranged side by side.

The windows 6a of the V-shaped blocks 6 are fitted into the link connecting bodies 3 and 4 juxtaposed in this manner, and the V-shaped blocks 6 are assembled one after another.

After fitting the last V-shaped block, insert the last pin 1 into the pin insertion hole 6C shown in FIG.
4 into an endless shape to complete the transmission belt assembly.

In addition, if you do not want to make the last V-shaped block in which the pin insertion hole 6C is to be made thick, align it with the mating surfaces of a pair of adjacent ■-shaped blocks as shown by the two-dot chain line in Fig. 2 ('b). Alternatively, a semicircular notch 6d may be formed, thereby forming a pin insertion hole.

In practical use, as shown in FIG. 1('b), the square block 6 is wound around the pulley groove 7, and the transmission belt is passed between the groove pulleys. At this time, the power of the driving pulley reaches the link connection body 3.4 from the V-shaped block 6 that is frictionally engaged with the V-groove of the driven pulley, and then passes through the V-shaped block 6 that is frictionally engaged with the V-groove of the driven pulley. It reaches the pulley and power can be transferred between both pulleys.

In this example, two link connecting bodies 3.4 are arranged in parallel so that the respective pins 1 are shifted in position, so that the arrangement pitch of the pins 1 is changed from L to % as shown in FIG. L, the bending pitch of the power transmission belt wound around the pulley groove 7 can be halved.As a result, the polygonal winding of the power transmission belt around the pulley becomes more circular in shape, and When the string is wound into the pulley groove 7 or when it is let out, the contact position with the pulley groove is only slightly displaced in the radial direction of the pulley, and string vibration can be reduced.

Also, when each V-shaped block 6 is located at both ends of the link plate (2) of the link connection body 3 (4) with the same structure, the link plate (2) of the other link connection body 4 (3)
) will be located in the center. Therefore, Boo IJVi
Even if the frictional engagement of the V-shaped block 6 with respect to t7 is not performed by the former link plate, it is performed by the latter link plate, and it is possible to eliminate the V-shaped block 6 that does not frictionally engage with the V-groove 7. can. Therefore, the load can be shared among all the V-shaped blocks in the pulley groove 7, and it is possible to prevent the load from being applied to a particular V-shaped block.

In addition, in order to achieve these effects more reliably,
As shown in FIG. 1 (C1), the inner edge 2a of the link plate 2 forming the inner periphery of the endless link connecting body 3.4 is shaped like an arc,
It is best to define the radius of curvature R as shown below. In other words, Fig. 2 (al) is a schematic diagram of the pulley winding of the transmission belt when the circular arc diameter is large as Rt. A schematic diagram when this is an intermediate value (gear ratio 1:1) like R1, and (e) is a schematic diagram when this is small like R1.The arc diameter R1 of the inner side of the link plate 12a
In the case where the transmission belt is wound around and the circular arc diameter is an intermediate value R1 as in the second example), all link plate inner edges 2a are determined to extend along a common circle concentric with the pulley.

In such a configuration, when the transmission belt is wound around the arc diameter is <R, as shown in FIG. 7 is used for frictional engagement, as described above (
Not only can the load be prevented from concentrating on a specific square block, but also the problem of the load being biased toward the link connecting body 3 or 4 for each square block can be eliminated.

The diameter of the circular arc of the transmission belt is as shown in Figure 2 (a).

When the value deviates from the intermediate value as shown in (e) and becomes larger or smaller, the above effect cannot actually be achieved, but it can be achieved to some extent, so it is better than when the inner edge 2a of the link plate is a straight line. is preferable.

By the way, if only the inner edge 2a of the link plate 2 is made into an arc shape, the shape becomes asymmetrical, which is disadvantageous in terms of parts management and assembly workability. It is best to have a circular arc shape.

Further, the number of endless link bodies to be arranged in parallel is not limited to two as in the above embodiment, but can be arbitrary, for example, four as shown in FIG.
It goes without saying that it is also possible to arrange the endless link bodies 11 to 14 of books side by side, and as the number of books arranged side by side increases, the arrangement pitch of the pins 1 becomes smaller, so that the above-mentioned effects can be exhibited even more markedly.

Furthermore, as shown in FIG. 4, an endless link connection body 15,
16, by making the thickness of the ■-shaped blocks 6 unequal instead of setting the deviation amount of the pin 1 to 2 of the pin arrangement pitch related to the other link connection body, the peak of the noise can be suppressed over a wide frequency range. It is possible to disperse the noise, and it is possible to improve the audible noise level in the low range.

(Effects of the Invention) As described above, in the power transmission belt of the present invention, a plurality of endless link connecting bodies are arranged side by side so that the positions of the pins are shifted. The polygonal winding has a shape close to a circle, which can suppress string vibration and reduce abnormal sounds and noise.Also, for the same structural reason, the V-shaped block floating in the boo groove is eliminated. This can prevent the load from concentrating on a specific ■-shaped block and reducing its durability.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the power transmission belt of the present invention, and FIG.
1 is a cutaway plan view of the main part, (b) is a longitudinal front view of the main part, (C) is a longitudinal sectional side view of the main part, and Figures 2 (al), (b), and (C) show the belt wrapped around the pulley, respectively. Figure 3 shows a schematic diagram showing each arc diameter.
4 and 4 are partially diagrammatic plan views showing other examples of the power transmission belt of the present invention, respectively. 1... Pin 2... Link plate 3.4.11-16... Endless link connection body 6...
V-shaped block 7...Pulley V-groove patent applicant Nissan Motor Co., Ltd. (ξp Fig. 3 Fig. 4

Claims (1)

[Scope of Claims] 1. A plurality of endless link connecting bodies each having a large number of pins connected to each other by link plates are arranged side by side so that the positions of the pins are shifted, and these endless link connecting bodies are A power transmission belt characterized in that V-shaped blocks that are laterally encircled and frictionally engaged with pulley V grooves are provided so as to be slidable in sequence in the longitudinal direction of the endless link connecting bodies arranged side by side. 2. The power transmission belt according to claim 1, wherein the link plate has an inner edge forming an inner periphery of the endless link connection body having an arcuate shape. 3. The power transmission belt according to claim 1 or 2, wherein the link plate has an arcuate outer edge that forms the outer periphery of the endless link connection body.