JPS633181B2 - - Google Patents

Description

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

V-belt transmission devices used in continuously variable transmissions, etc., can obtain greater frictional force than ordinary flat belts due to the wedge action on both inclined grooves of the pulley.
Although it is suitable for transmitting large amounts of power, a rubber V-belt may not be able to withstand the transmitted power because it is subject to large tension.

Furthermore, since the rubber V-belt is highly elastic, it has a large hysteresis loss.

A metal V-belt transmission device has been developed to overcome these inconveniences, one example of which is the metal V-belt transmission device shown in FIGS. 1 and 2.

The metal V-belt is constructed by integrally attaching a steel power transmission piece member 02 to a large number of endless thin steel plate belts 01 stacked one on top of the other in the thickness direction through locking portions 03 at both ends in the longitudinal direction. , and the same metal V-belt is spanned over a driving V-pulley 04 and a 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. Furthermore, the bridge member requires chamfering 02a according to the radius of rotation, which is troublesome to process, and also has drawbacks such as the inability to rotate if the assembly direction is incorrect.

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

An embodiment of the present invention illustrated in FIGS. 3 to 7 will be described below.

Reference numeral 1 denotes a continuously variable transmission for a motorcycle, and in the transmission 1, each V of a driving V pulley 2 and a driven V pulley 4 is
A V-belt 6 is stretched across the grooves 3 and 5.

Further, the V-belt 6 includes a large number of V-shaped metal members 7,
A needle roller 12, which is an elongated roller member interposed between the same number of V-shaped metal members 7, and an endless thin steel plate of a constant width that tightens the outer periphery of a connected unit consisting of the V-shaped metal member 7 and the needle roller 12. It consists of a flexible endless member 13 formed by stacking a large number of sheets.

Further, both side surfaces 8 of the V-shaped metal member 7 are symmetrically inclined so as to contact the V grooves 3 and 5 of the V-pulleys 2 and 4 at an inclination angle of θ, and the front and rear end surfaces 8 of the V-shaped metal member 7 9 are formed parallel to each other, and the inner front and rear end surfaces 9a have l ₁ in the width direction.
A circular arc-shaped groove 10 having a length and a radius of curvature r ₁ is formed, and rectangular notches 11 are formed on both outer sides 7a of the V-shaped metal member 7.

Further, in the needle roller 12, the length _l2 is set shorter than the length _l1 of the circular groove 10, and the radius _r2 is set smaller than the radius of curvature _r1 of the circular groove 10. ing.

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

Since the embodiment shown in FIGS. 3 to 7 is constructed as described above, the V-shaped metal is directed from the inside to the outside of the flexible endless member 13 made of endless thin steel plates stacked in multiple layers. By moving the member 7, the notch 11 of the V-shaped metal member 7 is inserted into the flexible endless member 13.
The needle roller 12 is engaged with the circular groove 10 of the V-shaped metal member 7, and this is repeated over the entire circumference of the flexible endless member 13.

Next, with the flexible endless member 13 in a circular shape, use a jig or the like to move the two V-shaped metal members 7, which sandwich the part where the needle roller 12 is not inserted, away from each other. The last needle roller 1 is applied to the opposing circular grooves 10 of both members 7.
2, the V-belt 6 can be assembled.

Since the V-belt 6 is assembled in this way, the needle roller 1 is
2 is held in the arc-shaped groove 10 of the V-shaped metal member 7. Therefore, when the V belt 6 is bent in contact with the V grooves 3 and 5 of the V pulleys 2 and 4, the V
Even when the needle roller 12 is located between the pulleys 2 and 4, it does not fall off.

In addition, when power is transmitted, the power is transmitted from the driving V-pulley 2 to the driven V-pulley 4 by normal belt tension.
Power is transmitted to.

Further, since the adjacent V-shaped metal members 7 are brought into contact with each other via the needle roller 12 in the arc-shaped groove 10, the bending deformation of the V-belt 6 is caused by the flexible endless member 13.
With only bending, the V-shaped metal member 7 can be easily swung by the needle roller 12, resulting in _high power transmission efficiency. Since the radius r is larger than ₂ , V
The V-shaped metal member 7 and the needle roller 12 are in rolling contact, and as a result, wear and friction loss between the V-shaped metal member 7 and the needle roller 12 are small.

Moreover, both side surfaces 8 of the V-shaped metal member 7 whose front and rear end surfaces are parallel are inclined in a V shape, and the inner front and rear end surfaces 9a
By simply forming a circular arc groove 10 in the V-shaped metal member 7
can be configured, resulting in high productivity and low cost.

Further, since the rubber spacing member 14 is integrally fixed to the outer surface of the flexible endless member 13 outward from the location where the needle roller 12 is located, the rubber spacing member 14 is integrally fixed to the outer surface of the flexible endless member 13. Even if a force F that causes the portions 7a to approach each other is applied to the V-shaped metal member 7, the engagement of both ends 14a of the rubber spacing member 14 with the outer side portions 7a of the V-shaped metal member The above-mentioned movement is inhibited, and the adjacent V-shaped metal members 7 are prevented from inclining abnormally, and the distance between the adjacent circular grooves 10 is also prevented from widening, so that the needle roller 12 is It is prevented from falling off from the isolated groove 10.

Further, in the above embodiment, as shown in FIGS. 8 to 9, the notch 11 of the V-shaped metal member 7 is filled with a rubber connecting member 15, and the V-shaped metal member 7 and the flexible endless member 13 are connected. 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. 16 and the notch 1 of the V-shaped metal member 7
1 and a rubber connecting member 17 embedded in the rubber connecting member 17, and the same effects as in the embodiment described above can be achieved.

Furthermore, the flexible endless member may be configured with chain lines.

Further, in the embodiment described above, the needle roller 12 whose generating line is a parallel straight line is used as the elongated roller member, but as shown in FIG. Alternatively, the elongated roller members 18 and 19 may be formed as curved rotating bodies.

In the present invention, in a V-belt transmission device that spans a driving V-pulley and a driven V-pulley and transmits power between the two pulleys, both side surfaces are inclined so that the V-belt
A V-shaped member having an inclined surface in contact with the V-groove of the pulley is cut out at its outer center, and grooves into which the elongated roller member is fitted are formed on both sides of the V-shaped member, and the grooves are connected to each other via the elongated roller member. At the same time, since the outer periphery of the connected unit consisting of the V-shaped member and the elongated roller member was tightened via the flexible endless member, the V-shaped members do not cause sliding friction but roll friction, and therefore generate heat. The power loss is small, the power transmission efficiency is high, and the transmitted power is large.

Further, in the present invention, in the V-belt transmission device, a means is provided for maintaining a constant interval between adjacent parts of the V-shaped member located outward from the flexible endless member, so that The spacing between the shaped member portions is maintained constant, the contact surface spacing 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. .

Furthermore, when the V-shaped member is fitted into the V-groove of the pulley, the V-shaped member is always maintained in an optimal state, so the fitting between the V-shaped member and the V-groove is carried out easily, and uneven wear is not caused on the contact surface. This improves durability.

Furthermore, in the present invention, since the V-belt is constituted by the V-shaped member, the elongated roller member, the flexible endless member, and the spacing means, the weight of the V-belt can be reduced and the high-speed power transmission characteristics are improved.

[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 embodiment of the V-belt transmission according to the present invention. The illustrated side views, FIGS. 4 and 5 are cross-sectional views taken along the lines - and - in FIG. 3, FIG. 6 is a vertical sectional side view of FIG. 3, and FIG. 7 is the same embodiment. FIGS. 8 and 9 are cross-sectional views of the same parts as FIGS. 4 and 5 of still another embodiment, and FIGS. 10 and 11 are views of still another embodiment. The cross-sectional view and longitudinal cross-sectional view of the embodiment, and FIGS. 12 and 13 are perspective views of the elongated roller member having a different shape in each of the embodiments. 1... Continuously variable transmission for motorcycles, 2... Drive V pulley, 3... V groove, 4... Driven V pulley, 5... V groove, 6
... V belt, 7 ... V-shaped metal member, 7a ... both outer parts, 8 ... both side surfaces, 9 ... front and rear end surfaces, 9a ... inner front and rear end surfaces, 10 ... circular arc groove, 11 ... notch, 12 ... needle Roller, 12a... Both end surfaces, 13... Flexible endless member, 14... Rubber spacing member, 14a... Both ends, 15... Rubber connecting member, 16... Metal endless rope, 17... Rubber connecting member, 18 , 19...Elongated roller member.

Claims (1)

[Claims] 1. In a V-belt transmission device that spans a driving V-pulley and a driven V-pulley and transmits power between the two pulleys, a V-shaped member having an inclined surface with both side surfaces inclined and in contact with the V-groove of the V-pulley is used. The V-shaped member has a notch in its outer central portion, and grooves into which the elongated roller member is fitted are formed on both sides of the V-shaped member, and are brought into contact with each other via the elongated roller member, and are made of the same V-shaped member and the elongated roller member. means for tightening the outer periphery of the connecting unit via a flexible endless member and maintaining a constant interval between adjacent parts of the V-shaped member located outward from the flexible endless member; A V-belt transmission device characterized by the following.