JPS6159411B2 - - 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 a 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, rubber V-belts may not be able to withstand the transmitted power because of the large tension involved.

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. It is configured,
The metal V-belt is stretched around 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 during rotational motion.
There is a lot of friction and it is inefficient. 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 V-belt transmission device that is easy to process and yet durable enough to reliably and efficiently transmit large amounts of power. The purpose of this invention is to provide a V-belt transmission device with high performance.

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

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 driving V-pulley 2 and a driven V-pulley 4.

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 pulleys 2 and 4 at a predetermined angle of inclination.
The front and rear end surfaces ₉ of the _V A rectangular notch 11 is formed in the outer part of the shaped metal member 7.

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

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. The member 7 is moved to fit the notch 11 of the V-shaped metal member 7 into the flexible endless member 13, and the needle roller 12 is engaged with the arcuate groove 10 of the V-shaped metal member 7. 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 arcuate 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 arcuate 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, of course the V
Even when the needle roller 12 is located between the pulleys 2 and 4, it does not fall off.

In addition, during power transmission, in addition to the normal power transmission by belt tension, V-shaped metal member 7 to which torque is transmitted in contact with V-groove 3 of drive V-pulley 2
Needle roller 12 located on the moving side of belt 6
The compressive force is transmitted to the V-shaped metal member 7 on the same moving side through the needle roller 1.
2 and the driven V pulley 4 via the V-shaped metal member 7.
is transmitted to the V-shaped metal member 7 in contact with the V-groove 5 of the
Power is transmitted to.

Furthermore, since the adjacent V-shaped metal members 7 are brought into contact with each other via the needle rollers 12 in the arc-shaped grooves 10, the bending deformation of the V-belt 6 is caused by the flexible endless member 13.
The V-shaped metal member 7 can be easily swung by the needle roller 12 with only bending, and the V-shaped metal member 7 and the flexible endless member 13 do not slip relative to each other. does not generate heat and has high power transmission efficiency.

Furthermore, since the radius of curvature r ₁ of the arcuate groove 10 is larger than the radius r ₂ of the needle roller 12, 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.

Furthermore, the V-shaped metal member 7 and the flexible endless member 13 do not slide against each other and are not worn out, so the durability is high.

Moreover, both end surfaces 8 of the V-shaped metal member 7 whose front and rear end surfaces 9 are parallel are inclined in a V shape, and the inner front and rear end surfaces 9
Since the V-shaped metal member 7 can be constructed by simply forming the arcuate groove 10 in the groove a, productivity is high and costs are low.

In the embodiment described above, the arcuate grooves 10 formed on the inner front and rear end surfaces 9a of the V-shaped metal member 7 do not reach as far as both side surfaces 8, but in order to simplify processing as shown in FIG. The arcuate groove 10 may be formed to reach both side surfaces 8.

Further, in the above embodiment, FIGS. 9 to 1
As shown in Figure 0, the notch 1 of the V-shaped metal member 7
1 is filled with a rubber connecting member 14, and the V-shaped metal member 7 and the flexible endless member 13 are integrally connected to each other by the connecting member 14. The V-shaped metal member 7 is prevented from moving in a direction perpendicular to the direction, and the flexible endless member 13 and the notch 1 are
Prevent contact with 1.

Furthermore, in the embodiment described above, a large number of endless thin steel plates were stacked together, but as shown in FIGS. 15 is integrally covered with the notch 1 of the V-shaped metal member 7.
1 and a rubber connecting member 16 embedded in the rubber connecting member 16, and the same effects as in the embodiment described above can be achieved.

Furthermore, the flexible endless member may be composed of a chain or the like.

Further, in the above embodiment, the needle roller 12 whose generatrix is a parallel straight line is used as the elongated roller member, but as shown in FIG. Alternatively, the elongated roller members 17 and 18 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, a large number of V-shaped members in contact with the pulleys are brought into contact with each other via an 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 is tightened via the flexible endless member, the V-shaped members do not cause sliding friction but roll friction. Therefore, no heat is generated, power loss is small, power transmission efficiency is high, and the transmitted power is large.

Further, in the present invention, since there is no need to perform special processing on the V-shaped member, processing and assembly are easy.
Cost is low.

Furthermore, in the present invention, the outer periphery of the connected unit consisting of the V-shaped member and the elongated roller member is tightened via the flexible endless member with the flexible endless member in contact with the outer periphery of the elongated roller member, so that the V-belt When the material is held between the pulleys and conveyed, a difference occurs between the circumferential length of the flexible endless member and the circumferential length of the mutually contacting portion of the V-shaped member and the elongated roller member at the outer periphery of the pulley. A tension force acts on the endless member and a compressive force acts on the V-shaped member and the elongated roller member, and the flexible endless member is strongly pressed against the elongated roller member, and the flexible endless member is released from the V-shaped member without the need for any special engagement structure. Power is reliably transmitted to the flexible endless member and from the flexible endless member to the V-shaped member, the structure is not complicated, the cost is low, and local wear is avoided. Highly durable.

[Brief explanation of the drawing]

Figure 1 shows a side view of a conventional V-belt transmission, and
The figure is a cross-sectional view cut along the line - in Figure 1, Figure 3 is a side view illustrating an embodiment of the V-belt transmission device according to the present invention, and Figures 4 and 5 are Figure 3. 6 is a longitudinal cross-sectional view of FIG. 3, FIG. 7 is a perspective view of the V-shaped metal member of the same embodiment, and FIG. 8 is a diagram of another embodiment. A perspective view of the V-shaped metal member of the example, FIGS. 9 and 10 are cross-sectional views of the same parts as FIGS. 4 and 5 of another example, and FIGS. 11 and 12 are still other views. 13 and 14 are perspective views of elongated roller members having different shapes in each of the embodiments, respectively. 1... Continuously variable transmission for automatic dual-purpose vehicles, 2... Drive V pulley, 3... V groove, 4... Driven V pulley, 5... V groove, 6
...V belt, 7...V-shaped metal member, 8...both sides, 9
...Front and rear end surfaces, 9a...Inner front and rear end surfaces, 10...Circular grooves, 11...Notches, 12...Needle rollers, 13
...Flexible endless member, 14...Rubber connecting member, 15
...Endless rope, 16...Rubber connecting member, 17,1
8...Elongated roller member.

Claims (1)

[Claims] 1. In a V-belt transmission device that spans a driving pulley and a driven pulley and transmits power between the two pulleys, an arc-shaped recess is formed approximately at the center of both the front and rear surfaces of a large number of V-shaped members that contact the pulley, The V-shaped members are brought into contact with each other at the arc-shaped recess through the elongated roller member, and a flexible endless member is brought into contact with the outer periphery of the elongated roller member,
A V-belt transmission device, characterized in that the outer periphery of the connected unit consisting of the V-shaped member and the elongated roller member is tightened via the flexible endless member.