JPS5926643A - V-belt power transmission device - Google Patents

Abstract

PURPOSE:To improve the workability of an endless V-belt and to make it possible to transmit large power efficiently by a method wherein slender rollers and V-blocks are arranged alternately on the outer periphery of a flexible endless member serving as the endless belt. CONSTITUTION:The metallic V-blocks each having a notch and the needle rollers 12 are arranged alternately on the flexible endless member 13 formed by laying steel bands on above another. Each of the needle rollers 12 is fitted in a groove formed in each of the metallic blocks 7 so as to be supported by the latter. Further, rubber spacers 14 are inserted inbetween each of the metallic V-blocks 7 so as to keep constant the spaces distance between the adjoining V-blocks 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a V-belt transmission device that transmits power by using a V-shaped cross section.

V-belt transmission devices are used in continuously variable transmissions, etc.

Due to the wedge action on both inclined grooves of the pulley, a larger frictional force can be obtained compared to an ordinary flat belt, making it suitable for transmitting large amounts of power. It may not be able to withstand the transmitted power.

Also, the rubber V-belt is highly elastic.

Hysteresis loss is large.

To overcome these disadvantages, metal V-belt transmissions have been developed, examples of which include the metal V-belt transmissions shown in FIGS. 1 and 2.

The metal belt consists of a large number of endless thin steel plate bells (01) stacked on top of each other in the thickness direction, and a steel power transmission piece member (02) is integrally attached in the longitudinal direction by locking portions (03) at both ends. It is made of the same metal and the belt is driven.
It is spanned between the boot IJ O4 and the driven V pulley 05.

However, the metal V-belt transmission shown in FIGS. 1 and 2 is heavy, and the bridge members slide into contact with each other in the rotating portion, resulting in high friction and poor efficiency. The single piece member requires chamfering 02a according to the radius of rotation, which has drawbacks such as cumbersome machining and failure to rotate if the assembly direction is incorrect.

The present invention relates to a V-belt transmission device that overcomes the above-mentioned difficulty, and its purpose is to provide a V-belt transmission device that is easy to process and yet
However, the object of the present invention is to provide a highly durable V-belt transmission device that can transmit large amounts of power reliably and efficiently.

Hereinafter, a simple embodiment of the present invention illustrated in FIGS. 3 to 7 will be described.

Reference numeral 1 designates a continuously variable transmission for a motorcycle, and in the transmission 1, a V-belt 6 is stretched between grooves 3 and 5 of a drive V-pulley 2 and a driven pulley 4.

The V-belt 6 also includes a large number of V-shaped metal members 7, a needle roller 2 which is an elongated roller member interposed between the same number of V-shaped metal members 7, the same ■-shaped metal member 7, and a needle roller 12. It consists of a flexible endless member 13 made by stacking a large number of endless thin steel plates of a certain width to tighten the outer periphery of a connected unit made of.

Furthermore, both side surfaces 8 of the V-shaped metal member 7 have an inclination angle of θ.
The V-shaped metal member 7 is formed so as to be symmetrically inclined so as to be in contact with the grooves 3 and 5 of the pulleys 2 and 4, and the front and rear end surfaces 9 of the V-shaped metal member 7 are parallel to each other.
A circular arc-shaped groove 10 having a length tl in the width direction and a radius of curvature rl is formed in the V-shaped metal member 70, and rectangular notches 11 are formed in the outer parts 7a on both sides of the V-shaped metal member 70. ing.

Furthermore, the length t2 of the needle roller J2 is set shorter than the length tl of the circular arc groove 10, and the radius r2 thereof is set smaller than the radius of curvature r1 of the circular groove [0]. .

Furthermore, a rubber spacing member 14 is attached to the outer surface of the flexible endless member 13 at the location where the needle roller 12 is located.
are fixed integrally, and both end portions 14a of the spacing member 140 are engaged with the outer portions 7a of the V-shaped metal member 70 on both sides.

Since the embodiment shown in FIGS. 3 to 7 is constructed as described above, the flexible endless member 13 made of endless thin steel plates stacked in multiple directions has a V-shape extending from the inside to the outside. The metal member 7 is moved to fit the notch 11 of the square-shaped metal member 7 into the flexible endless member 13, and the needle roller 2 is engaged with the arc-shaped groove 10 of the square-shaped metal member 7. This process is then repeated over the entire circumference of the flexible endless member I3.

Next, this flexible endless member 13 is made into a circular shape.

Using a jig or the like, force is applied to the two square metal members 7 in the direction of separating the two square metal members 7 that sandwich the part where the needle roller 12 is not interposed, and the opposing arcuate grooves of the two members 7 are removed. When the last needle roller] 2 is engaged with 10, the V-belt 6
can be assembled.

Since the V-belt 6 is assembled in this manner, the needle roller 12 is held in the arcuate groove 10 of the V-shaped metal member 7 by the flexible endless member 13, and therefore the V-belt 6
The needle roller 12 will not fall off, not only when (1) it is curved in contact with the V grooves 3, 5 of the pulleys 2, 4, but also (2) when it is located between the pulleys 2 and 4.

Further, during power transmission, power is transmitted from the driving V-pulley 2 to the driven V-pulley 4 by power transmission using normal belt tension.

Furthermore, the V-shaped metal members 7 adjacent to each other in the π phase are brought into contact with each other through the needle roller 12i at the one-circular groove 10.

The bending deformation of the V-belt 6 is only accompanied by the bending of the flexible endless member 13, and the V-shaped metal member 7 can be easily swung by the needle roller 12, resulting in high power transmission efficiency.

Furthermore, since the radius of curvature r1 of the arc-shaped groove [0] is larger than the radius r2 of the needle roller 12, the ■-shaped metal member 7 and the needle roller 12 come into rolling contact.

As a result, wear and friction loss between the ■-shaped metal member 7 and the needle roller 12 are reduced.

Moreover, both sides Bi of the V-shaped metal member 7 whose front and rear end surfaces are parallel
It is inclined in a V shape and has a circular groove 10 on the inner front and rear end surfaces 9a.
Since the V-shaped metal member 7 can be constructed by simply forming the V-shaped metal member 7, productivity is high and costs are low.

Further, a rubber spacing member 14 is provided on the outer surface of the flexible endless member 13 outward from the location where the needle roller 12 is located.
are fixed together, so even if a force F is applied to the V-shaped metal member 7 that causes the outer portions 7a on both sides of adjacent V-shaped metal members 7 to approach each other, the same ■-shaped metal member 7 Both sides outer part 72
Rubber spacing member 140 both ends 14 a
The above-mentioned movement is prevented by the engagement r, and the abnormal inclination of the square metal members 7 adjacent to each other in the same phase is prevented, and the interval between the twisted circular grooves 10 is prevented from widening. , the needle roller 12 is prevented from falling off from the arc-shaped groove.

Further, in the above embodiment, as shown in FIGS. 8 to 9, the V-shaped metal member 7 has a notch and a rubber connecting member 1.
5, and the ■-shaped metal member 7 and the flexible endless member 13 may be integrally connected to each other by the connecting member 15. Note that in this case, the rubber spacing member 14 and the rubber connecting member 15 are separated.

Furthermore, in the embodiment described above, a large number of endless thin steel plates were stacked together, but as shown in FIGS.
When the endless metal rope 6 (a synthetic fiber rope may be used) and the same rope 16 are integrally covered, a rubber connecting member 17 is embedded in the notch 11 of the V-shaped metal member 7.
It is also possible to have the same operation and effect as in the above embodiment.

The flexible endless member 7 may be roughly configured with chain lines.

Further, in the above embodiment, the needle roller 12 whose generating line is a parallel straight line was used as the elongated roller portion 4-, but the 12th
As shown in FIG. 13 or FIG.
The elongated roller member J8.19 may be formed on a rotating body in which the generatrix of 8.1.9 is a centrally symmetrical broken line or curved line.

In the present invention, in a V-belt transmission device that spans a drive pulley and a driven pulley and transmits power between four-sided pulleys, both sides are inclined and the V-pulley σ] has an inclined surface that contacts the groove. A notch in the outer center of the V-shaped member and a groove into which the elongated roller member is fitted! al' The V-shaped mouth-shaped member is formed and brought into contact with each other via an elongated roller member, and the same 2-shaped member and the elongated roller member are formed. c.
Since the outer periphery of the connecting unit is tightened through the flexible endless member, the V-shaped parts roll and rub against each other without sliding friction. Therefore, no heat is generated, power loss is small, and power transmission efficiency is improved. It is expensive and has a large transmission power.

Further, in the present invention, in the V-bell transmission device, means is provided for maintaining a constant interval between adjacent parts of the V-shaped member located outward from the flexible endless member. The distance between the V-shaped parts is maintained constant, and the distance between the contact surfaces of the elongated roller members in the adjacent V-shaped members is maintained constant, and the elongated roller members are prevented from falling off from the V-shaped member. be done.

Furthermore, since the V-shaped member is always held in an optimal state (when it is fitted into the V-groove of the pulley), the fitting between the This improves durability.

Furthermore, in the present invention, the ■bell) is composed of the ■shaped member, the elongated roller member, the flexible endless member, and the spacing means, so that the weight of the ■bell) can be reduced, and the high-speed power transmission characteristics are improved. do.

[Brief explanation of the drawing]

Fig. 1 is a side view of a conventional V-belt transmission, Fig. 2 is a cross-sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is an example of the V-belt transmission according to the present invention. j A side view illustrating an application example, FIGS. 4 and 5 are cross-sectional views taken along lines IV--IV and V-V in FIG. 3, and FIG. 6 is a longitudinal side view of FIG. 3. , FIG. 7 is a perspective view of the v-shaped metal member of the same embodiment, FIGS. 8 and 9 are still further FIG. 4 of another embodiment,
A cross-sectional view of the same part as in Fig. 5, Fig. 10 and Fig. 11.
The figures also show a cross-sectional view and a vertical cross-sectional view of another embodiment.
FIG. 2 and FIG. 13 are perspective views of elongated roller members having different shapes in the respective embodiments. 1... Continuously variable transmission for motorcycles 12... Drive V pulley, 3... ■Groove, 4... Driven V pulley, 5... V
Groove, 6...V bell b17...V-shaped metal member, 7a.
・Both sides outer part ・8... Both sides, 9... Front and rear end surfaces,
9a... Inner front and rear end surfaces, 10... Circular groove, 11.
...Notch, 12...Needle roller, 12 a...
- Both end surfaces, 13...Flexible endless member, 14...Rubber spacing member, 14a...Both ends, I5...Rubber connecting member, 16...Metal endless lobe, 17 ...
Rubber connecting member, 18.19...Elongated roller member.

Claims (1)

[Claims] Spread between a driving V pulley and a driven ■ pulley. In a V-belt transmission device that transmits power between both pulleys, a V-shaped member is provided with a notch in the outer center of the V-shaped member having inclined surfaces on both side surfaces and in contact with the grooves of the boot; Grooves into which the members fit are formed on both sides of the V-shaped member, and the grooves are brought into contact with each other via an elongated roller member,
The outer periphery of a connected unit consisting of the same V-shaped member and an elongated roller member is tightened via a flexible endless member, and the intervals between adjacent parts of the v-shaped attached portions located outward from the flexible endless member A V-belt transmission device, characterized in that it is provided with means for maintaining the V-belts at a constant interval.