JPH0762494B2 - Transmission belt - Google Patents

Description

TECHNICAL FIELD The present invention relates to a transmission belt that is used by being stretched between V-groove pulleys.

(Prior Art) Various types of transmission belts of this type have been known in the past.
There is one as shown in Japanese Patent No. 42345.

This transmission belt has a link connecting body in which a large number of pins are connected to each other by a link plate, and a series of V-shaped blocks are provided on the link connecting body so as to be slidable in the longitudinal direction. In practical use, the V-shaped block is wound around the pulley V-groove so that power can be transferred between both V-groove pulleys.

(Problems to be solved by the invention) However, in the lever type transmission belt, the V-shaped block has the pulley V.
The pulley V has a polygonal winding shape due to the existence of the link plate when it is wound into the groove or unwound.
Since the contact position with the groove is changed in the radial direction of the pulley, string vibrations that are repeatedly displaced toward and away from each other occur in the linear portion of the transmission belt between the V-groove pulleys. This string vibration not only causes the V-shaped block to collide with the pulley to generate abnormal noise, but also causes vibration due to tension fluctuations of the transmission belt to increase noise.

Also, in the transmission belt portion wound around the pulley V 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 is frictionally coupled to the pulley V groove, but the V-shaped blocks at both ends of the link plate float in the pulley V groove, The load is concentrated on the V-shaped block in the center of the link plate, which causes deterioration of durability.

In order to solve this problem, it is conceivable to reduce the arrangement pitch of the pins, but in the above-mentioned conventional transmission belt, the diameter of the pins and the length of the link plate determined in relation to this are limited to some extent in terms of strength. However, there is a limit to reducing the pin arrangement pitch (about 8 mm), and such an arrangement pitch cannot solve the above problem.

The present invention, instead of such measures by changing the specifications,
The main purpose is to improve the configuration, that is, to form the link connection bodies in a plurality of rows, thereby substantially reducing the pin arrangement pitch, and thereby reliably solving the above problem.

By the way, if you make the linked body into multiple columns like this,
The pin of each link connecting body may protrude from the outermost link plate in order to prevent the outermost link plate from coming off. Therefore, the width of the transmission belt is increased by an amount corresponding to the end protrusion of the pin. Inevitably, therefore, the ratio of the number of link plates to this width, that is, the transmission capacity, is reduced.

According to the present invention, the width of the transmission belt can be made relatively small even when the link connecting bodies are arranged in a plurality of rows for the above-mentioned main purpose, and the ratio of the number of link plates to the width of the transmission belt, that is, the transmission capacity is reduced. It is also intended to make a transmission belt that does not occur.

(Means for Solving the Problems) For these purposes, the power transmission belt according to the present invention includes a plurality of endless link connecting bodies in which a large number of pins are connected to each other by a link plate. The pins are arranged side by side in the longitudinal direction of the endless link joints between the joints so that the end portions of the endless link joints have the protruding ends of the pins adjacent to each other. The juxtaposed endless link connection includes a V-shaped block that collectively surrounds the projecting end portion of the endless link connection body in the longitudinal direction of the endless link connection body under lateral contact and frictionally engages with the pulley V groove. It is characterized in that they are sequentially arranged in the longitudinal direction of the body.

(Operation) During practical use of the transmission belt that is stretched between the V-groove pulleys, the power of the drive-side pulley reaches from the V-shaped block frictionally engaged with the V-groove to the link link body and then the driven-side pulley. Through the V-shaped block frictionally engaged with the V-shaped groove to reach the pulley and enable transfer of power between both pulleys.

By arranging a plurality of link connecting bodies side by side so that the positions of the pins are displaced, the arrangement pitch of the pins becomes a distance between the pins of the link connecting bodies and becomes small, and the bending pitch of the transmission belt can be made small. As a result, the polygonal winding shape of the transmission belt around the pulley becomes close to a circle, and when the V-shaped block is caught in the pulley groove,
The contact position with the pulley V groove is slightly displaced in the radial direction of the pulley when it is paid out, and the string vibration can be reduced. Therefore, the V-shaped block almost does not collide with the pulley due to the vibration of the string to generate an abnormal noise, and the fluctuation of the tension of the transmission belt due to the vibration of the string is small, and the noise caused by this is almost eliminated.

Further, the following action can be obtained by a configuration in which a plurality of link connecting bodies are arranged side by side so that the positions of the pins are displaced. That is, in the transmission belt portion wound around the pulley V groove, even if each V-shaped block is located at both ends of the link plate of a certain link connecting body, it is located at the center of the link plate of another link connecting body. With this link plate, the V-shaped block floating in the pulley V groove can be eliminated by securely frictionally engaging the pulley V groove. Therefore, the load can be distributed to all the V-shaped blocks in the pulley V groove, and the problem that the load is concentrated on a specific V-shaped block can be eliminated.

In addition, when a plurality of endless link connecting bodies are juxtaposed as described above, each endless link connecting body has a protruding end of the pin and an endless end of the adjacent endless link connecting body. Since the link connecting bodies are juxtaposed so as to overlap in the longitudinal direction, the pins of each link connecting body project from the outermost link plate to prevent the link plate at the outermost side from coming off. The amount of protrusion at the end does not cause the width of the transmission belt to increase, and the width of the transmission belt can be made relatively small, so that the ratio of the number of link plates to this width, that is, the reduction of the transmission capacity can be avoided. it can.

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

FIG. 1 shows an embodiment of a power transmission belt of the present invention. FIG. 1 (a) is a cutaway plan view of essential parts, FIG. 1 (b) is a vertical sectional front view, and FIG.

Reference numeral 1 in these figures denotes a large number of pins, and these pins are mutually connected by a link plate 2 to form endless link coupling bodies 3 and 4. Each pin 1 is 2 in the radial direction.
It is well known as a silent pin composed of divided parts 1a and 1b, and by making the divided surfaces mutually opposite cylindrical surfaces, the link plates 2 make rolling contact of the opposite cylindrical divided surfaces as shown in FIG. 1 (c). So that it can rotate.

In this example, the two endless link connecting bodies 3 and 4 are connected to the pin 1
Side-by-side so that the positions of
Are made to enter between the pins 1 of the other link connecting body so that the pins 1 mutually overlap in the longitudinal direction of the link connecting body between the link connecting bodies. At this time, if there is a gap between the ends of the pins 1 that have entered each other, the bush 5 (in the drawing, 1
Link gap 3,
The relative position in the longitudinal direction of 4 should be kept unchanged.

The V-shaped blocks 6 surrounding the link connecting bodies 3 and 4 in contact with each other in the lateral direction are sequentially arranged in the longitudinal direction of the link connecting bodies 3 and 4. Therefore, the windows formed in each V-shaped block 6
Protrusions 6b are provided between 6a to keep the relative positions of the link connectors 3 and 4 in the axial direction of the pin (1) unchanged.

When assembling the above-mentioned power transmission belt, link link
The links 3 and 4 are assembled until just before the endless shape, and the link connectors 3 and 4 are juxtaposed. The window 3a of the V-shaped block 6 is fitted into the link connecting bodies 3 and 4 arranged side by side in this way, and the V-shaped block 6 is sequentially assembled. When the final V-shaped block is fitted, the link connecting bodies 3 and 4 are removed while inserting the final pin 1 from the pin insertion hole 6c shown in FIG. 2B provided in the final V-shaped block. Complete the assembly of the transmission belt with the end shape. If it is not desired to thicken the last V-shaped block provided with the pin insertion hole 6c, face the mating surfaces of a pair of adjacent V-shaped blocks as shown by the chain double-dashed line in FIG. 2 (b). The semicircular cutout 6d may be formed to form the pin insertion hole.

In practical use, as shown in FIG. 1 (b), the V-shaped block 6 is wound around the pulley V groove 7 and the transmission belt is stretched between the V groove pulleys. At this time, the power of the driving pulley is changed from the V-shaped block 6 frictionally engaged with the V groove to the link connecting body 3,
4, it reaches the pulley via the V-shaped block 6 frictionally engaged with the V groove of the driven pulley, and power can be transferred between the two pulleys.

In this example, the link connecting bodies 3 and 4 are set as a pair of two,
By arranging each pin 1 side by side,
The arrangement pitch of the pins 1 is 1 / L as shown in FIG. 1 (a).
It can be halved to 2L, and the bending pitch of the transmission belt wound in the pulley V groove 7 can be halved. As a result, the polygonal winding shape of the transmission belt around the pulley becomes closer to a circle, and when the V-shaped block 6 is wound into the pulley V groove 7 or when it is paid out, the contact position with the pulley V groove is only slightly in the radial direction of the pulley. It is not displaced and the string vibration can be reduced.

Also, when each V-shaped block 6 is positioned at both ends of the link plate (2) of a certain link connecting body 3 (4), the V-shaped blocks 6 of the other link connecting bodies 4 (3) are centered in the same manner. Will be located in the department. Therefore, the pulley V
Even if the V-shaped block 6 is not frictionally engaged with the groove 7 by the latter link plate, the V-shaped block 6 that is not frictionally engaged with the V groove 7 can be eliminated. . Therefore, the load can be shared by all the V-shaped blocks in the pulley V groove 7,
It is possible to prevent a load from being applied to the specific V-shaped block.

By the way, when the endless link connecting bodies 3 and 4 are juxtaposed with each other, as described above, each endless link connecting body is connected with the projecting end portion of the pin of the adjacent endless link connecting body and the endless link connecting body. Since they are juxtaposed so as to overlap in the longitudinal direction of the bodies 3 and 4, the pin 1 projects from the outermost link plate in order to prevent the link plate at the outermost side from coming off. The amount of protrusion does not cause the width of the transmission belt to increase, and the width of the transmission belt can be made relatively small, and the ratio of the number of link plates to this width,
That is, it is possible to avoid a decrease in transmission capacity.

In order to achieve the above-mentioned effects more reliably,
As shown in FIG. 1 (c), it is preferable that the inner edge 2a of the link plate 2 forming the inner circumference of the endless link connecting bodies 3 and 4 is arcuate and the radius of curvature R ₁ thereof is determined as follows. That is, the second
Figure (a) is a schematic view of a pulley winding arc diameter of the transmission belt as R _l large, FIG. (B) This is an intermediate value as R _m (transmission ratio 1: 1) when it is The schematic diagram (c) is a schematic diagram when this is small like R _s .
The arc diameter R ₁ of the link plate inner edge 2a is common when all the link plate inner edges 2a are concentric with the pulley when the winding arc diameter of the transmission belt is an intermediate value R _{m as} shown in FIG. 2 (b). It is decided to extend along a circle.

In such a configuration, when the winding arc diameter of the transmission belt is R _m as shown in FIG. 2 (b), the link connecting body 3,
(4) All the link plates 2 serve to frictionally engage the V-shaped block 6 with the pulley V-groove 7, so that the load can be prevented from concentrating on a specific V-shaped block as described above. It is possible to eliminate the problem that the load is biased toward the link connecting body 3 or 4 for each block.

In addition, the winding arc diameter of the transmission belt is as shown in FIG.
If it becomes larger or smaller than the intermediate value as shown in (c), the above-mentioned action and effect cannot be actually achieved, but since it can be achieved to some extent, the link plate inner edge 2a is more likely to be straight. preferable.

By the way, in the link plate 2, if only the inner edge 2a is arcuate, the shape becomes asymmetric, which is disadvantageous in terms of parts management and assembly workability. Therefore, the outer edge 2b is also indicated by R ₁ in FIG. 1 (c). It is better to have a similar arc shape.

Further, the number of juxtaposed endless link coupling bodies is not limited to the two in the above embodiment, but may be any number, for example, as shown in FIG.
It is needless to say that it is also possible to arrange the endless link connecting bodies 11 to 14 of the books side by side, and as the number of juxtaposed links increases, the arrangement pitch of the pins 1 becomes smaller and the above-mentioned action and effect can be more remarkably exhibited.

Further, as shown in FIG. 4, when the endless link connecting bodies 15 and 16 are juxtaposed, the displacement amount of the pin 1 is not set to 1/2 of the pin arrangement pitch related to the other link connecting body, and the V-shaped block 6 By making the thicknesses unequal, it is possible to disperse the noise peaks over a wide frequency range, and it is possible to achieve a audible noise low range.

(Effects of the Invention) As described above, since the transmission belt of the present invention has a plurality of endless link connecting bodies arranged side by side so that the positions of the pins are displaced as described above, the arrangement pitch of the pins is reduced and the transmission belt is wound around the pulley in a polygonal shape. As the shape approaches a circle, string vibration can be suppressed and abnormal noise and noise can be reduced. Further, for the same reason, the V-shaped block floating in the V-shaped groove can be eliminated, and it is possible to prevent the load from being concentrated on a specific V-shaped block and lowering the durability.

In addition, when a plurality of endless link connecting bodies are juxtaposed as described above, each endless link connecting body has a protruding end of the pin and an endless end of the adjacent endless link connecting body. Since the link connecting bodies are juxtaposed so as to overlap in the longitudinal direction, the pins of each link connecting body project from the outermost link plate to prevent the link plate at the outermost side from coming off. The amount of protrusion at the end does not cause the width of the transmission belt to increase, and the width of the transmission belt can be made relatively small, so that the ratio of the number of link plates to this width, that is, the reduction of the transmission capacity can be avoided. it can.

[Brief description of drawings]

FIG. 1 shows an embodiment of the power transmission belt of the present invention, in which FIG. 1 (a) is a cutaway plan view of a main portion thereof, (b) is a vertical sectional front view thereof, and (c) is a vertical sectional side view of the main portion thereof. (A), (b) and (c) are schematic views showing the pulley wrapping portion of the belt for each winding arc diameter, and FIGS. 3 and 4 are other examples of the transmission belt of the present invention. It is a partial diagrammatic plan view showing. 1 …… Pin 2 …… Link plate 3,4,11 to 16 …… Endless link connection 6 …… V type block, 7 …… Pulley V groove

Claims (1)

[Claims] 1. A plurality of endless link connecting bodies in which a large number of pins are connected to each other by a link plate.
The endless link connecting bodies are juxtaposed so that the positions of the pins are displaced from each other in the longitudinal direction of the endless link connecting body, and the endless link connecting bodies are arranged such that the projecting ends of the pins are adjacent to each other. The juxtaposed V-shaped blocks are encircled together in lateral contact so as to overlap the projecting end of the pin of the connector and the endless link connector in the longitudinal direction and frictionally engage with the pulley V groove. A transmission belt, wherein the endless link connection body is sequentially arranged in the longitudinal direction.